Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf11a3cc2dccbd43…

MALICIOUS

PDF

51.2 KB Created: 2020-08-19 20:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8a9dc4f702bc5086b9c50d489389ed4f SHA-1: a60c1f9a1c0577d9fb8e5e9c0237e2762731b27b SHA-256: bf11a3cc2dccbd43f19aaf6f2cf1974712e2146c3a712e897cd41d9a7d1d4c64
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, embedding a large number of external links. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=redhat+firewall-+cmd+cheat+sheet'. The document body, though heavily obfuscated, contains references to the same URL, suggesting it is the primary lure. The presence of numerous links, many pointing to unknown or potentially malicious domains, indicates a campaign to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=redhat+firewall-+cmd+cheat+sheet In PDF document text
    • http://puzege.phisigmapidavis.com/uploads/1/3/1/3/131379730/sujipijelenewurex.pdfIn PDF document text
    • http://files.chefscommissarykitchen.com/uploads/1/3/1/4/131436991/wumejikuvovowi_volofiberiz_buzatevujijuv.pdfIn PDF document text
    • http://files.wofcca.org/uploads/1/3/1/0/131070539/4ef47ada.pdfIn PDF document text
    • http://files.walsh4one.com/uploads/1/3/2/6/132683292/luwisile.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0319/9133/files/scratch_2._0_free_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2920/8983/files/tinoxima.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8438/2357/files/show_box_app.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/3658/5629/files/free_online_editor_delete_pages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8046/6080/files/spider_man_ps4_trophy_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/trumpet_voluntary_piano_sheet_music_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0227/7542/files/begokep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5301/3409/files/hello_brother_telugu_audio_songs_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/moluku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5372/6358/files/kenozonopidifudilapaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4579/5493/files/rakedasek.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6948 5392 bytes
SHA-256: c28624749896456d8b2670e0441aefcdf6c8d5eddfe047ee362a48bc59807d30
font_01_sfnt_off00007b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B90 15120 bytes
SHA-256: 0311a7ac9b59b5df3999920cf09c7929eaba5bc7e8ee2896791c111902651fb8
font_02_sfnt_off0000ab02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB02 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953