Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0775877d777b251…

MALICIOUS

PDF

47.5 KB Created: 2020-08-08 00:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7877db5226be89787c01991ed0d991d SHA-1: 0f512cfb214d1f52042333c17f93401b100c27ea SHA-256: a0775877d777b2519516805e1083ba9fb237ec60d68c18f3ff3b1b3839d727e2
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of an SEO link farm, embedding numerous links to external PDFs hosted on Shopify.com, likely to manipulate search engine results. One of these links, 'https://ttraff.ru/pify?keyword=korean+alphabet+pronunciation+in+english+pdf', is identified as a malicious redirector. The document body contains garbled text and a reference to the same malicious URL, suggesting a deceptive lure. No scripts were extracted, and the primary malicious activity observed is the redirection via the embedded malicious link.

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=korean+alphabet+pronunciation+in+english+pdf
    • http://gurewa.pursewithpurpose.org/uploads/1/3/1/0/131070786/4263438.pdf
    • http://files.accentsdancewear.com/uploads/1/3/0/8/130874554/4898918.pdf
    • http://files.learningspacesandlearningstyles.com/uploads/1/3/1/4/131455463/juduzemud_kibinududotus.pdf
    • http://deradifov.globalgardenfarm.org/uploads/1/3/2/8/132814930/4372809.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7202/files/89887557397.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89186344985.pdf
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/67385070662.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/activate_windows_10_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/manual_fuel_tank_selector_valve.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4920/files/tikujulazepifiter.pdf
    • https://cdn.shopify.com/s/files/1/0431/9979/1265/files/6032326216.pdf
    • https://cdn.shopify.com/s/files/1/0440/4687/6837/files/6th_grade_social_studies_geography_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/celestial_navigation_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/0141/1744/files/poriv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.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_off00007a98.bin
b1d2dedf51b3cedef3c358ac7ec3d05965d46bec8f9a53e70a1e74bf0ce4cdd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A98 5524 bytes
font_01_sfnt_off00008d55.bin
67301c233dbcd1b3d80d4c196f5fa03b6d62c7a7cf77d4800fcb8e080ce79809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D55 10308 bytes

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