Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eef15956b051f09…

MALICIOUS

PDF

43.9 KB Created: 2020-07-30 03:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee55437ce5f289c8776e3d45e2925105 SHA-1: 6d625a5aab37eea3ad0d323e71d00df4ebea4f02 SHA-256: 6eef15956b051f090f1940d226ea7883bf944824ebeb6a2d3181154c30e54af2
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a link farm of 17 other PDFs, indicating a content-scraping or SEO-based malicious distribution campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector and a link farm suggests an attempt to distribute further malicious content or phish users.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=nutricion+parenteral+procedimiento+pdf
    • http://files.austinsexpeditions.com/uploads/1/3/1/4/131454482/limirejezumosulijowi.pdf
    • http://files.visionsofadventure.com/uploads/1/3/0/9/130969761/nutusesidobubenono.pdf
    • http://files.centralmissouricarpenters.org/uploads/1/3/2/6/132682124/sigirabas.pdf
    • http://files.watermarin.org/uploads/1/3/1/4/131483421/5485384.pdf
    • http://files.theprincipalstory.com/uploads/1/3/1/6/131608017/ed05943867aa9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/paxazisojuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/77971468889.pdf
    • https://cdn.shopify.com/s/files/1/0429/6117/4684/files/wenanomuzusawuvogap.pdf
    • https://cdn.shopify.com/s/files/1/0434/1451/9973/files/jaxefadodenowapaselewa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/11868994461.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/puwumoxufuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/zikubuxebidofikuxowit.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/63158042058.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0730/files/83730027593.pdf
    • https://cdn.shopify.com/s/files/1/0435/1629/7368/files/72313403977.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3020/files/82520217334.pdf
    • https://cdn.shopify.com/s/files/1/0434/4102/9276/files/91066830817.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_off00006f4c.bin
24dccaf15b3b7eb3137c3063d55dcf6865c68dea60a858a5288fd15d695f5f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4C 4972 bytes
font_01_sfnt_off0000801c.bin
ecf23de13643d17cd425f5a456c5fd44dede3fb5a3decc893d490ebd5a6e8894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801C 10164 bytes

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