Malicious PDF — malware analysis report

Static analysis result for SHA-256 b186748e3a363093…

MALICIOUS

PDF

36.6 KB Created: 2020-08-12 17:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23788cb6e07db0deff0c5ffa85dd951d SHA-1: 9b9a789f02f5aee2390a1adcac4e8b4d920d2a44 SHA-256: b186748e3a3630937420ea581cf4e32a549815ae62115a8bc8d989b122f2f73f
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 external PDFs hosted on various domains. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which likely serves as the initial stage for delivering a payload. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, reinforcing the lure strategy. 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=believe+polar+express+noten+pdf
    • http://files.tundedecor.com/uploads/1/3/1/0/131071067/fipiwexo.pdf
    • http://letavidom.toyaussietown.com/uploads/1/3/1/6/131606094/469348.pdf
    • http://files.kingdomtransformationchurch.org/uploads/1/3/1/3/131380688/5405786.pdf
    • http://pesal.paschalorchestra.com/uploads/1/3/0/8/130873951/57a68158c48e3.pdf
    • http://vijawupun.transformationalastrologyandtarot.com/uploads/1/3/2/6/132681862/7fe904380c9.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5050/files/pwn_the_sat.pdf
    • https://cdn.shopify.com/s/files/1/0435/5473/4235/files/67354084115.pdf
    • https://cdn.shopify.com/s/files/1/0430/3280/5527/files/23828113245.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/48129986419.pdf
    • https://cdn.shopify.com/s/files/1/0434/1936/9628/files/20841741818.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/kixukexonob.pdf
    • https://cdn.shopify.com/s/files/1/0437/1356/0727/files/51036255118.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9667/files/beowulf_short_summary.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/9th_grade_spelling_bee_words.pdf
    • https://cdn.shopify.com/s/files/1/0433/3823/6062/files/fundamental_of_thermodynamics_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/6870/3398/files/bhagavad_gita_slokas_with_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0452/8229/5969/files/alzheimer_s_disease_malayalam.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_off00005069.bin
0bfd629d59b7ff2a863f4ea246a0190c52289fa8832baf9eab715a6d5385a91e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5069 5212 bytes
font_01_sfnt_off0000623b.bin
1ba3e0d3b0a58d2db72310e6458f6a32b689d2484ee923ad93d9bcbad06173f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623B 10260 bytes

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