Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4e1ff60073e939…

MALICIOUS

PDF

38.0 KB Created: 2020-08-19 08:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfc3cde4c9d6e926f41e8c888115a846 SHA-1: 31ac31b1bce60fca1853fe091ea0b0ecb29a3bcb SHA-256: 2a4e1ff60073e9390f179e0040c6d93842986251020132eccd1eefbee5c3384d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm or SEO poisoning attack. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=aashiqui+2+mashup+song++bestwap'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the manipulation of search engine results or direct user redirection through the embedded links.

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=aashiqui+2+mashup+song++bestwap
    • http://files.mightypineacres.com/uploads/1/3/1/4/131438437/6191504.pdf
    • http://files.tacdlo.org/uploads/1/3/0/7/130775429/8690191.pdf
    • http://files.bustingbibleignorance.com/uploads/1/3/0/7/130776148/2831341.pdf
    • http://files.tremplinfle.com/uploads/1/3/0/7/130775361/8158437.pdf
    • http://buvesufo.foryourgetaways.com/uploads/1/3/1/4/131406071/dunabubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/kelune.pdf
    • https://cdn.shopify.com/s/files/1/0429/6799/0438/files/meme_generator_old_design_apk.pdf
    • https://cdn.shopify.com/s/files/1/0440/4038/8758/files/52338948565.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tiwimuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/peluwefeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/gutupu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5823/files/79065346416.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1622/files/how_to_install_showbox.pdf
    • https://cdn.shopify.com/s/files/1/0433/5845/3918/files/lajonaxidivoxaguzilupifof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.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_off00004b9f.bin
cd1438eaee682c50bd037673da3448479146aac4430f35b5648e374a03d74f30
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B9F 5584 bytes
font_01_sfnt_off00005e91.bin
4eb4e167a76310db494e11f58f3ccb28b1441d4c2a19bfdadea640c821fda9d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E91 14200 bytes