Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f405ce295086642…

MALICIOUS

PDF

40.3 KB Created: 2020-08-21 08:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d5902f1d0a90e7c8882f4941bf3bc9e SHA-1: b9e83fe31f6da8ea960695da3af3959f736b8abb SHA-256: 7f405ce295086642a9d8528fa34d2c884b10ed9b8e147416409363f17f2d3679
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to lure users with promises of 'latest tamil movies'. The primary malicious redirector URL is https://ttraff.com/pify?keyword=latest+tamil+movies++in+utorrent. The document body, though heavily obfuscated, contains references to this lure. The ML classifier strongly flagged this PDF as malicious, and heuristic rules confirm the presence of malicious redirector links and a link farm.

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=latest+tamil+movies++in+utorrent
    • http://tubaji.simplybeautifulpg.ca/uploads/1/3/1/4/131437792/61294.pdf
    • http://files.borobot.org/uploads/1/3/2/7/132740270/1c32dfc010beac.pdf
    • http://files.1boxonline.com/uploads/1/3/1/8/131857334/polojekijatazozo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7367/files/sagekogepidugupudesinaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/89736693802.pdf
    • https://cdn.shopify.com/s/files/1/0429/0736/9639/files/sivawemaxazekodolovaga.pdf
    • https://cdn.shopify.com/s/files/1/0454/5613/0200/files/seragedaperad.pdf
    • https://cdn.shopify.com/s/files/1/0430/8143/3242/files/74992384317.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1569/files/jomopa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5766/7487/files/working_class_hero_tab.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9863/files/gotepitupoguzalepubij.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3616/files/background_funny_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/5052/3031/files/37452512934.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe0.bin
61301c15f6f0400b9972d3142befd19c9fbe1619d48c2a07bae69431d6281695
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE0 4832 bytes
font_01_sfnt_off0000703e.bin
196a970d6b6d1cafceaa84eff5cdf4eb7705b21e5a25dfd2232f035f2e2d6df6
pdf-font-stream PDF embedded font (sfnt) at offset 0x703E 10688 bytes