Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76c177e68a2aa72…

MALICIOUS

PDF

53.8 KB Created: 2020-08-30 14:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54468eb73f9b3d749bc3446a7f1a460b SHA-1: b732bc012590f85f2d31829e6b3bec0a6b4797a6 SHA-256: a76c177e68a2aa7254407b66dd467f5256513feda707ffd771a1d9646d5f62d5
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO spam and phishing. One critical heuristic identified a malicious redirector link pointing to 'ttraff.ru', which is used to lure users with search terms like 'tronxy x5s manual bed leveling'. The document body, though heavily obfuscated, contains the same search term and the malicious URL, indicating an attempt to disguise malicious activity as relevant content. The presence of a large number of links to Shopify PDFs suggests a link farm strategy to improve search engine ranking for the malicious URL.

Heuristics 3

  • 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.
  • 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/wix?keyword=tronxy+x5s+manual+bed+leveling
    • https://cdn.shopify.com/s/files/1/0437/2729/0518/files/south_korea_culture.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/8949302822.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/vexobitosezivipixa.pdf
    • https://cdn.shopify.com/s/files/1/0448/4094/3778/files/hunger_games_2_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/2492/4319/files/568289750.pdf
    • https://cdn.shopify.com/s/files/1/0438/8156/2280/files/41193296514.pdf
    • https://cdn.shopify.com/s/files/1/0434/1150/5302/files/brms_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0468/9883/9714/files/descriptive_correlational_design.pdf
    • https://cdn.shopify.com/s/files/1/0432/4861/5579/files/25903244960.pdf
    • https://cdn.shopify.com/s/files/1/0432/6408/2073/files/65535577250.pdf
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/68371887517.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/vernier_caliper_measurement_video.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6519/files/42833955581.pdf
    • https://cdn.shopify.com/s/files/1/0457/8630/0572/files/activity_3_induced_magnetism_guide_question.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2876/files/mapa_turistico_andalucia.pdf
    • https://static.usrfiles.com/ugd/b8c837_85a02cd4e13f44c7a75ca7189ebe6650.pdf
    • https://static.usrfiles.com/ugd/5b604d_d6f0cbe7249f47ebab47063b263b9d62.pdf
    • https://static.usrfiles.com/ugd/b8c837_15186ec41161480583a176251b50e5bb.pdf
    • https://static.usrfiles.com/ugd/804ff6_9dd19388e861428cb00c50a4514ee276.pdf
    • https://static.usrfiles.com/ugd/b8c837_71ee7a45dfad423e9b5932f2d52fef28.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008727.bin
a607c89e8b59a3e4d24e2b367d392483b075957f5bee95879b6ceb19d6b244b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8727 5392 bytes
font_01_sfnt_off00009963.bin
f202f2c852bfecca8389892ed400741dce95c51d987e64a18b1d77b780b6cf83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9963 9968 bytes
font_02_sfnt_off0000bb91.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB91 4324 bytes

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