Malicious PDF — malware analysis report

Static analysis result for SHA-256 651bfee0fad2deae…

MALICIOUS

PDF

40.3 KB Created: 2020-09-02 05:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ee82b47b7338dfce60fa57c40a9415 SHA-1: 47c11c379060b5ba2d03808deee8b6d381f226f4 SHA-256: 651bfee0fad2deae8bd556622ecc56482b6f8acd0442bda3a314800455233721
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious due to its inclusion of a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that points to a redirector service, likely intended to lead the user to a malicious site. The presence of numerous external PDF links further suggests a link farm or SEO manipulation tactic to distribute malicious content.

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.link/wix?keyword=biuret+test+for+proteins+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/plastic_degrading_bacteria.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2438/files/anemias_gpc.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/flannel_sheets_at_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0437/7182/2232/files/pakistani_bridal_images_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7599/files/samurai_shodown_64.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/rokitoliwapavebavipofi.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_da9991e765ee4bf480d7283109d3b1ff.pdf
    • https://static.usrfiles.com/ugd/c618e9_87640a3c08584cd8a1f8480b104fa501.pdf
    • https://static.usrfiles.com/ugd/23e9be_22aac870b1d34b4cb95aa637226b5ef7.pdf
    • https://static.usrfiles.com/ugd/73cb9e_4431226db85645519c8d000383ba96b8.pdf
    • https://static.usrfiles.com/ugd/ecec20_6fe803f8abf04b4a87d6bb909f75d8ef.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/cg_new_bewafa_video.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/giwixugupuzoferopuled.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/kufefunoso.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/singing_cluster_ffxiv.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006126.bin
4454038dde693ad6cae6262038cf8d83eb2686d0e84dc4b1835703408d7f005f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6126 4840 bytes
font_01_sfnt_off000071b2.bin
ed495212355092bb0f2022ba8a13647ada51f271e89bef0eb62712ebfb261ac2
pdf-font-stream PDF embedded font (sfnt) at offset 0x71B2 10256 bytes