Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dda2612000e905…

MALICIOUS

PDF

42.1 KB Created: 2020-08-03 21:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 337cea72f01b1746f3d982473118d043 SHA-1: d5d86eb18fd9487ec5371d7aade6826d30fbb5d1 SHA-256: 77dda2612000e90523259101bf8172dc027f462b43189403201fae40b8a3af01
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains embedded URLs that are part of a link farm, further indicating malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=statistical+learning+using+r+pdf
    • http://files.selbyvillepetandgarden.com/uploads/1/3/0/8/130813055/3436fe13d8aa0.pdf
    • http://files.jartjewelry.com/uploads/1/3/1/3/131380308/f87bf5.pdf
    • http://files.indigolightpath.com/uploads/1/3/1/4/131454034/12bc1844707.pdf
    • http://files.amandamarkle.com/uploads/1/3/1/8/131871484/jusurinasolalere.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5393/8853/files/62063605656.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51906755497.pdf
    • https://cdn.shopify.com/s/files/1/0437/0799/0169/files/fibufoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4294/6724/files/85258688438.pdf
    • https://cdn.shopify.com/s/files/1/0449/9403/5880/files/92_cadillac_deville.pdf
    • https://cdn.shopify.com/s/files/1/0430/6917/8017/files/28817407578.pdf
    • https://cdn.shopify.com/s/files/1/0433/9050/1020/files/lejagamelozu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/55533226180.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2261/files/39693711826.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9751/files/how_to_convert_to_vertex_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/70412586340.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/guvanozazopi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/74943139232.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_off00006602.bin
fabd11d9728e4a2e97635c84879ab14f2fc9c224d988de49517f16733adeb75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6602 5424 bytes
font_01_sfnt_off00007881.bin
ce7972c28f2234f732e4ae7e8bfec99728b127acbdbfbeffca86e980db615274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7881 10272 bytes

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