Malicious PDF — malware analysis report

Static analysis result for SHA-256 6654d4c485113d89…

MALICIOUS

PDF

40.7 KB Created: 2020-08-22 09:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a43098d35b22096e8cd49a475ed7ede SHA-1: eeef0dfafe93a904e34b2ecbb293da84c8306340 SHA-256: 6654d4c485113d890fa27fc27c612f3bc301ac661276e8ddfe06b3802ed9c1a0
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=barbie+doll+makeup+game+free`. It also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to Shopify-hosted PDFs. The document body, though heavily obfuscated, contains the same lure and URLs, suggesting an attempt to drive traffic to malicious sites under the guise of a game download.

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=barbie+doll+makeup+game+free
    • http://wimowo.stloop.com/uploads/1/3/0/7/130776485/dd14d2a2d240bb0.pdf
    • http://files.dobwallsjuniorsfc.co.uk/uploads/1/3/1/3/131398143/vebuvobubaluxipoju.pdf
    • http://files.cliostools.net/uploads/1/3/0/8/130814644/4461188.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4517/5971/files/amagami_ss_plus.pdf
    • https://cdn.shopify.com/s/files/1/0430/3156/0354/files/nuguribagotusa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7395/2158/files/fafitel.pdf
    • https://cdn.shopify.com/s/files/1/0461/8479/2217/files/fatal_frame_ghost_list_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/8187/6131/files/air_conditioning_system_in_automobile.pdf
    • https://cdn.shopify.com/s/files/1/0436/4346/9974/files/wewobewebogev.pdf
    • https://cdn.shopify.com/s/files/1/0434/0757/3149/files/64825869170.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7623/files/intel_hd_graphics_4400_driver.pdf
    • https://cdn.shopify.com/s/files/1/0433/0553/3598/files/57642725317.pdf
    • https://cdn.shopify.com/s/files/1/0435/6577/7059/files/20906339126.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6050/files/71377519487.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
0cec9da1ec1694d81d58bc73ed898f07032cae48c484969852ba31a6908da6e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6032 5436 bytes
font_01_sfnt_off0000729d.bin
dae1c9de6fa0de8e0f70f83101bf445df297c9efc5acef8ab80698c99230932a
pdf-font-stream PDF embedded font (sfnt) at offset 0x729D 10424 bytes