Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f45d3441b4c1f9f…

MALICIOUS

PDF

41.3 KB Created: 2020-08-26 22:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a7687b266d0870e2acb923cda233a3 SHA-1: 696e6c0072109ef29eeeeed6d1b7fffa4da5c0bc SHA-256: 8f45d3441b4c1f9fa45277e9bab4fd651b3ed3b10287695f5d698fdedab23171
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself appears to be largely obfuscated or contains minimal readable content, but the presence of the malicious redirector and the link farm strongly suggests an attempt to lure users to malicious content or manipulate search engine results.

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=se%25C3%25B1or+cara+de+papa
    • http://bedimomop.zioncommunityfarm.org/uploads/1/3/0/7/130776099/tokazomutusa_balokap_rexuwozeteb_rumawurawof.pdf
    • http://files.emilyfortinphotography.com/uploads/1/3/1/4/131454270/f49c80.pdf
    • https://cdn.shopify.com/s/files/1/0432/9711/2219/files/45766111180.pdf
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/72544185422.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/kurejivefuki.pdf
    • https://cdn.shopify.com/s/files/1/0428/6277/2380/files/koxadoxanelok.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/nesuluruwulafogamu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/zerabena.pdf
    • https://cdn.shopify.com/s/files/1/0428/6123/2294/files/3326140055.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2641/files/velatifabejel.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1718/files/37121154417.pdf
    • https://cdn.shopify.com/s/files/1/0429/5960/1830/files/27745643443.pdf
    • https://cdn.shopify.com/s/files/1/0428/8924/8924/files/52464888798.pdf
    • https://cdn.shopify.com/s/files/1/0461/9983/2729/files/dancing_baby_screensaver.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/lekapopuwirigajonos.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/26610781165.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_off000053a6.bin
18ee4239b3699fd845cc63f222461fa37e7950feb7ffdab397064c51b869050f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53A6 4724 bytes
font_01_sfnt_off0000639b.bin
52c4e115da7ea27f5fbfa9d4c4d567075a1b46dc655ed9a72152b7e9d0fcbba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639B 11332 bytes
font_02_sfnt_off000088d6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88D6 4324 bytes

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