Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efb8d8c5370bfbe…

MALICIOUS

PDF

47.9 KB Created: 2020-08-08 14:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f2c6ddd8a6d14b211859e6df5321bbac SHA-1: 0c6f2282a9de32b46ac2610eae6306d1438bbaeb SHA-256: 5efb8d8c5370bfbe669e381fd402e6ca03ff3c8cd438fd8fd89db02ef3a16f27
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many of which point to a redirector service (ttraff.com) known for malicious activity. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to trick users into downloading further malicious content. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=origin+of+computer+graphics+pdf In PDF document text
    • http://files.jeepinforjesus.com/uploads/1/3/0/8/130813042/2585817.pdfIn PDF document text
    • http://files.pennyormsbee.ca/uploads/1/3/0/7/130775017/2113830.pdfIn PDF document text
    • http://files.montevistalacrosse.com/uploads/1/3/1/3/131398574/d61e585657cdb8c.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/1/0432/1561/8215/files/chhattisgarh_map_blank.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ledoviz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1566/6840/files/lojuxumaregexajinukoloze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0154/3830/files/ecological_pyramids_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/releninibijexotulajutavur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50306279194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2392/4376/files/zoology_textbook_class_11.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/xavofukimale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8794/6143/files/oreshura_episode_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/zumisiradarojawadopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0525/4566/files/mixed_present_tenses_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5871/7087/files/hemifacial_spasm_adalah.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8514/3969/files/lejositomubuxuvepixoponok.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_off00006790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6790 5564 bytes
SHA-256: c28a6660e1c9be2ff9f658039fee0f62268aa68fa43e6bdb800d9dca866c7f7f
font_01_sfnt_off00007a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A52 9860 bytes
SHA-256: e4bc8b245ff0fa2eaaaf9563213c7190a97eea58594840d6587d4f52c710a96d
font_02_sfnt_off00009c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C47 16040 bytes
SHA-256: 0d7b5de48ff5001cbee3948371e67b6999b3c8dc9da2328298d75d3db101b009