Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b4dbddcc4b57f4…

MALICIOUS

PDF

45.9 KB Created: 2020-07-23 17:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d81f275d45fec7b3d04c0fd9b1ce8a66 SHA-1: c8e413b0613818a093dd1a682352be7b6df38ee5 SHA-256: 66b4dbddcc4b57f4e1e2d7756159ce5fed1f96d1db66ddd02df4c00e5bccf6a5
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent.

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=bombsquad+apk+free
    • http://files.ocmsmedicaljobs.org/uploads/1/3/1/4/131407965/pagojaji-lefifinogujil-lexininebu-malep.pdf
    • http://files.anis.nu/uploads/1/3/0/7/130739470/d7274e03428.pdf
    • http://files.niwotptac.com/uploads/1/3/2/3/132302768/8803648.pdf
    • http://files.entsocont.ca/uploads/1/3/0/9/130969153/7350385.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/rixogopexutuserep.pdf
    • https://cdn.shopify.com/s/files/1/0433/9479/3630/files/dexoturen.pdf
    • https://cdn.shopify.com/s/files/1/0435/1678/8900/files/jaxigekif.pdf
    • https://cdn.shopify.com/s/files/1/0438/3608/0288/files/mojek.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1268/files/80962624851.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12086745869.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/tosusifasikoleje.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/41970507976.pdf
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/21070841935.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/nifenabedawugenosiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/63042484705.pdf
    • https://cdn.shopify.com/s/files/1/0436/4887/6702/files/suvafurilabibijetiren.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_off00007730.bin
0235bbd785075b1556dd00806a26f76ea75e000149f772cd517712be0de067e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7730 5184 bytes
font_01_sfnt_off000088c1.bin
6ee2ff1074ace76e8e2cd62c981dd4f7cf1452e7b2309edd3ab032e9e5db5237
pdf-font-stream PDF embedded font (sfnt) at offset 0x88C1 9908 bytes