Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c87baccf273de1…

MALICIOUS

PDF

40.3 KB Created: 2020-08-23 09:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe47757a67188d757c5951bcbe63a776 SHA-1: 7cf0efb136d0bbb29c7158ddc9e97f7081a3d22e SHA-256: 06c87baccf273de137be58e90f5d821e4cf10cc1054637171a2e02d9cb19d18a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to potentially malicious redirector infrastructure. The primary malicious link identified is 'https://ttraff.cc/pify?keyword=theatre+and+interculturalism+pdf', which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to disguise malicious activity as legitimate content. The ML classifier also strongly indicated maliciousness.

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=theatre+and+interculturalism+pdf
    • http://zakifiv.marathondelimd.com/uploads/1/3/0/9/130969648/vobejodifiwurupa.pdf
    • http://files.nabokovonline.com/uploads/1/3/0/7/130775537/topelif.pdf
    • http://files.betsyhendersondesigns.com/uploads/1/3/0/7/130740323/gotubiweremugun.pdf
    • http://jikude.biesebroek.eu/uploads/1/3/1/8/131856072/fozibegidubewojenov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1139/8041/files/91887342088.pdf
    • https://cdn.shopify.com/s/files/1/0429/6835/0873/files/26764280397.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/lujonagebedojifi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1334/9273/files/59130968018.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/zoboresumasabiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/74776542612.pdf
    • https://cdn.shopify.com/s/files/1/0429/5298/2684/files/dixibabokozujanak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53293114795.pdf
    • https://cdn.shopify.com/s/files/1/0436/8000/6294/files/ginatajuduriroxobo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/17835837242.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/introduction_to_sociology_101.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/6004492109.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_off00006032.bin
bfe0d2afbc31a7912f5c1ddd21ff144cde2c9e92b3ed65084a13e71cdfd6d356		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6032 5344 bytes
font_01_sfnt_off0000722f.bin
0ba777a5f45f09edd5fc1a6f9108380d9e6f492cdf797ace0af5160d942e87bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722F 10032 bytes

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