Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f148d158fc4a350…

MALICIOUS

PDF

44.8 KB Created: 2020-08-08 13:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb614c2a61d6daced9b11e2a3c2f03a9 SHA-1: 60a4f37c7b072d5b93f958db2dc23c21840aafc2 SHA-256: 2f148d158fc4a350df2190a13fec446fa2185a2255350355794ac019d990889e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=reduce+pdf+file+size+mac+os', suggesting a lure to disguise malicious activity. 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.ru/pify?keyword=reduce+pdf+file+size+mac+os
    • http://finadipe.amberyouragent.net/uploads/1/3/1/6/131637814/739c64757ea.pdf
    • http://files.clintjohnsonwrites.com/uploads/1/3/1/0/131070207/1130911.pdf
    • http://files.rcclouisville.com/uploads/1/3/0/8/130874241/7080d26d727bb.pdf
    • http://beguba.overlandmetalhead.com/uploads/1/3/2/3/132302780/zetefivewimosole.pdf
    • http://files.wynterproperties.com/uploads/1/3/1/1/131164431/nafogaruvomupi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/10059157793.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/were_can_i_watch_smallville.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/quando_quando_quando_chords.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3394/files/4368671663.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/amgen_biotech_experience_answers.pdf
    • https://cdn.shopify.com/s/files/1/0441/3492/4440/files/wewininogosivij.pdf
    • https://cdn.shopify.com/s/files/1/0431/6187/8687/files/30696679253.pdf
    • https://cdn.shopify.com/s/files/1/0438/4977/7312/files/pavaset.pdf
    • https://cdn.shopify.com/s/files/1/0439/0843/2027/files/57670170356.pdf
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/45457863511.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006287.bin
ffea214f2c6cfaa1473df408279020ae9b7d94d97a0ac64281d02a7ae2343cab
pdf-font-stream PDF embedded font (sfnt) at offset 0x6287 4960 bytes
font_01_sfnt_off00007377.bin
5bdaa4f0bb590b561b3d32282b2715c4d5b84109ec2a6237fd1082c87d8fe610
pdf-font-stream PDF embedded font (sfnt) at offset 0x7377 10736 bytes
font_02_sfnt_off0000982a.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x982A 4324 bytes