Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac7ab09fcb294e9…

MALICIOUS

PDF

39.1 KB Created: 2020-08-11 00:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb91542f339bddc18086ddd7cfd0cd06 SHA-1: b79eebbc0d7682aa805ddf03ee4ee51b12695d74 SHA-256: 5ac7ab09fcb294e995d09bf424ba5f43d47ecddb2c95df05e3366fd542fd3902
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector at `ttraff.com`. The document body, though obfuscated, contains text related to programming guides, suggesting a lure to disguise the malicious intent. The presence of a large number of external PDF links indicates a link farm strategy, likely to improve SEO for malicious content or to distribute further payloads.

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=c+al+programming+guide+pdf
    • http://gidogov.active-life-chiropractic.com/uploads/1/3/1/6/131607062/2e791cceb5b7a3.pdf
    • http://files.kengoesclick.com/uploads/1/3/1/3/131384173/felevisupifuw.pdf
    • http://files.nisquallymeadows.org/uploads/1/3/1/6/131607022/batetomimete.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0434/3857/1670/files/7946372526.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdf
    • https://cdn.shopify.com/s/files/1/0429/4367/6582/files/commonwealth_map_fallout_4.pdf
    • https://cdn.shopify.com/s/files/1/0428/4727/3116/files/lologelarobo.pdf
    • https://cdn.shopify.com/s/files/1/0447/5568/1431/files/academic_encounters_2nd_edition_reading_and_writing.pdf
    • https://cdn.shopify.com/s/files/1/0437/9194/1781/files/51051685318.pdf
    • https://cdn.shopify.com/s/files/1/0433/4243/0362/files/angielski_sownictwo_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/13142140563.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/wasalazan.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/1269060076.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/fugizikajom.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dc7.bin
657f97c652e21ccfca4f33c866c5fdc9a86d07e389feed2e6cdbef63016161de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DC7 5008 bytes
font_01_sfnt_off00005eb1.bin
a6ddc5e39a1a2c681e040d1369b751cf912552dc9b132e2d445f0e872e2cf0e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB1 10212 bytes
font_02_sfnt_off0000819d.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819D 4324 bytes

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