Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c2248120aa77e9…

MALICIOUS

PDF

61.3 KB Created: 2020-08-16 19:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 095be0ffc35f8e4d26e8572dd7f2e533 SHA-1: ec8dfc3ca2a5b63a863eb4b4c6c3ea3d42577b5a SHA-256: 88c2248120aa77e9cd92031f709179fcf05a6ee58c2df8162539bf32008a5729
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious infrastructure. This suggests a link farm or SEO poisoning tactic designed to funnel users to malicious content. The ML classifier also strongly indicated maliciousness.

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=cdsl+ka+full+form
    • http://laduk.jonrawlingspottery.com/uploads/1/3/1/4/131483167/5455588.pdf
    • http://sufik.emeraldtoursgolf.com/uploads/1/3/1/6/131607163/6653107.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/44497375202.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/navy_seal_weight_training_workout.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7600/files/xotavetuweweka.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/the_5th_wave_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/96751019937.pdf
    • https://cdn.shopify.com/s/files/1/0432/1955/0370/files/ff14_buying_a_house.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/wodokusekesir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rijakilijupefiwopoxafeza.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/jozanuguzeguxemifubaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/27978747619.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/top_down_and_bottom_up_approach.pdf
    • https://cdn.shopify.com/s/files/1/0435/9222/0840/files/tuduledumom.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/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000794e.bin
8e299ac970c5e9f233a91cbf673b4332e3e14f4503536d0b7e80843e03c48027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794E 5020 bytes
font_01_sfnt_off00008a47.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A47 3720 bytes
font_02_sfnt_off000095aa.bin
1a8141e3d53d440f9049a08b292b5b86b4999543dddb99e89a57a04d07110ae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95AA 11988 bytes
font_03_sfnt_off0000bce2.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE2 16164 bytes
font_04_sfnt_off0000d233.bin
851a783cd45cbb9aad2114148e01821c834fc378c0698827b185e6fcb1933047		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 5980 bytes

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