Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ec0c6e4b819b1e…

MALICIOUS

PDF

46.5 KB Created: 2020-07-30 12:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3c1e78dd7f97de16dcc92d76846bf82 SHA-1: 14478e6021c3226d48163526d97b68ba22df551f SHA-256: 64ec0c6e4b819b1e8fd017b8798b08a974ae770d1e167920927a02943ff23e35
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'https://ttraff.cc/pify?keyword=marksheet+format+in+excel+pdf'. The document body, though heavily obfuscated, suggests a lure related to 'Marksheet format in excel pdf'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=marksheet+format+in+excel+pdf
    • http://files.robertsfamilygenerations.com/uploads/1/3/2/8/132816036/f24e537.pdf
    • http://files.obellahome.com/uploads/1/3/1/8/131858975/3864548.pdf
    • http://files.womenwhowandertexas.com/uploads/1/3/1/4/131483027/e2be0c6.pdf
    • http://files.rtprogram.com/uploads/1/3/1/3/131381605/7952014.pdf
    • http://files.selfascensionstudios.com/uploads/1/3/1/3/131383323/da13715e981.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9550/7615/files/62848002197.pdf
    • https://cdn.shopify.com/s/files/1/0430/0079/1191/files/netidu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7517/3528/files/zimabujujubuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6072/files/nazopopuzolelunaginimoke.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/60290375968.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/sekanugikagax.pdf
    • https://cdn.shopify.com/s/files/1/0438/2277/6480/files/447386622.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0985/files/nomanabegorizebolawa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/64864893636.pdf
    • https://cdn.shopify.com/s/files/1/0437/8689/5512/files/xejukokajoviniras.pdf
    • https://cdn.shopify.com/s/files/1/0435/8579/8301/files/13273266225.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_off0000773e.bin
c7c809c30b5a613db686b34a951312382684a32852c2158c3d19ff2d3d800890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773E 5320 bytes
font_01_sfnt_off00008930.bin
2f35f80cfb413d84f897cfd9ec00a9343f581fb0249c4c5a153ae2f229777ebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8930 10316 bytes

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