Malicious PDF — malware analysis report

Static analysis result for SHA-256 1480009d355cdf0f…

MALICIOUS

PDF

35.1 KB Created: 2020-08-04 19:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de19c973cb12061611f77ee6ff5569d7 SHA-1: bfb9a691e158f2c8190c1a4d94069ddee458cda5 SHA-256: 1480009d355cdf0f7ba92d788722b8513222c6f312f2fea314e6d933f244bca1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking Shopify URLs, suggesting a link farm or SEO spam tactic. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector points to an attempt to lure users to 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.com/pify?keyword=trumpet+voluntary+brass+quintet+pdf
    • http://files.blacksheepsalonfl.com/uploads/1/3/1/4/131437633/kufiwetulirisesajok.pdf
    • http://files.sheilaberger.com/uploads/1/3/0/7/130739776/967646.pdf
    • http://files.xr103.com/uploads/1/3/0/8/130814531/78045.pdf
    • http://files.writteninspirations.com/uploads/1/3/0/8/130814623/dexipezujidedi_bodolipavulaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20659662050.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/50183548672.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/jeguzawudajifulede.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/6134185549.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6338597663.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/rukema.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6692/files/negusirenikosilirejagebes.pdf
    • https://cdn.shopify.com/s/files/1/0432/5697/1432/files/93061612159.pdf
    • https://cdn.shopify.com/s/files/1/0440/2823/1830/files/dvdfab_hd_decrypter.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/80425740405.pdf
    • https://cdn.shopify.com/s/files/1/0443/1472/2460/files/boule_de_suif_ekladata.pdf
    • https://cdn.shopify.com/s/files/1/0434/7291/2549/files/vedovapijitafejowifezaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/milin.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/mojaxisojikuzuwolagimitax.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_off00004967.bin
a2252d6270ffb426adad263c088c673ec98cc7ea653927a990bd12524249f956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4967 5564 bytes
font_01_sfnt_off00005c3d.bin
8954402ea6834fb50946f3c59578f528d004bd0eb68ff79c056f57d9b17acf41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3D 10316 bytes

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