Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8580d0353b2e181…

MALICIOUS

PDF

54.7 KB Created: 2020-08-12 02:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e15f3e8b28fb721fd66b449b2c3d6983 SHA-1: 6811c1d9c6685c716a68c5ec4f255b3d4d4a2f2f SHA-256: a8580d0353b2e181a0292790831d5afe716319a906f4359aa13664810680ba6a
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=placental+bed+disorders+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it's intended to be clicked. The presence of a large number of external PDF links, many pointing to Shopify, indicates a link farm strategy to potentially improve SEO or distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=placental+bed+disorders+pdf
    • http://files.tdmdance.com/uploads/1/3/1/4/131483336/fapubadarugini.pdf
    • http://files.leannereimer.com/uploads/1/3/0/7/130776168/6622052.pdf
    • http://jaralojuk.writercassmichaels.com/uploads/1/3/1/4/131438392/bupukuvagesu-monamo.pdf
    • http://files.mommatschis.com/uploads/1/3/1/4/131408620/wubigewatede_marusev_rulagamivasa_wutatizuguxodix.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/39314879658.pdf
    • https://cdn.shopify.com/s/files/1/0433/0533/6985/files/carnival_of_venice_trombone_solo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/rugomimemin.pdf
    • https://cdn.shopify.com/s/files/1/0435/4385/5258/files/surah_ar_rahman_rumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4955/7917/files/business_basics_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/gopinomozijurusiwobug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/35186657301.pdf
    • https://cdn.shopify.com/s/files/1/0437/9036/8929/files/benizeralijanaduworenil.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/47902281885.pdf
    • https://cdn.shopify.com/s/files/1/0434/7848/3096/files/qualities_of_a_good_research_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6480/files/bififarakokufovibofogesi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4201/1286/files/japarimekejibisira.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000095dc.bin
275f8af203934d9387fb2d87bc6b0d3e35a92aca160de136ee4138991924a233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95DC 5288 bytes
font_01_sfnt_off0000a7d2.bin
2683562492f29fcab9cc105123424f4d6a302cc1920cec2756574fa7a85bec38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7D2 11600 bytes

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