Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d43cc862b106711…

MALICIOUS

PDF

43.5 KB Created: 2020-08-11 01:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e7d425e25969168701980539885820f SHA-1: 1b1cb3a84cd2c36ee5dbe348f481f20cb309c465 SHA-256: 7d43cc862b106711a6549fde6e1019e987016b2bfac73deca962b4cb9b1ae687
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a redirector link to a known malicious domain, indicating a phishing or redirection attempt. The document body, though heavily obfuscated, contains the malicious URL, suggesting the intent is to lure the user to click on it. The ML classifier strongly supports the malicious nature of this PDF.

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=mrityunjay+kadambari+marathi+pdf+file
    • http://files.evilsizor.co/uploads/1/3/1/6/131606490/jotugezefe.pdf
    • http://files.spashphysics.com/uploads/1/3/2/6/132681504/nipewowifodokogamem.pdf
    • http://xarevilo.thebalistreetdog.com/uploads/1/3/0/8/130874254/durukapuduge_jufalojasonamuw.pdf
    • http://savem.woolandmen.com/uploads/1/3/1/4/131453574/940946.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6705/files/bhagavad_gita_yatharoop_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/33868542716.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/97701963221.pdf
    • https://cdn.shopify.com/s/files/1/0428/9937/4233/files/sociologija_kulture_i_umetnosti.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/resepo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7047/8746/files/77752302378.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/traitement_de_surface_aluminium.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/fuxagipasofizisaris.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/54275996466.pdf
    • https://cdn.shopify.com/s/files/1/0449/2325/6999/files/94269761701.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/13417751769.pdf
    • https://cdn.shopify.com/s/files/1/0437/8509/3281/files/86932850075.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_off000069fb.bin
9560a6ed7d4d833768e50b067703b6b0ae4106724d5a3b691e3773a88dd8f481
pdf-font-stream PDF embedded font (sfnt) at offset 0x69FB 5492 bytes
font_01_sfnt_off00007c90.bin
028a7497e8ca20ae0abbb4898fa2eb3ea1d583a6a2a1eb50a8a0264d6fc0e091
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C90 10608 bytes