Malicious PDF — malware analysis report

Static analysis result for SHA-256 619acf08b4e1e7e0…

MALICIOUS

PDF

42.3 KB Created: 2020-07-27 18:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77a683fb142990f14abb79c212f625cc SHA-1: a488e9a7f19d393f09ddadc66e63709a49c3bba4 SHA-256: 619acf08b4e1e7e0c2be40125bacf5cc08c4fa43601671a041ca88bb8abdcb6d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, with the primary link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of a link farm and a malicious redirector suggests an attempt to lead users to harmful content, possibly for phishing or malware distribution.

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=gamesir+g4s+guide
    • http://files.taryngillen.com/uploads/1/3/0/8/130814529/b3eb8.pdf
    • http://files.davesthoughts.com/uploads/1/3/1/3/131384589/kefurelozag_sijiketovesapo_ranumofarunon_zofoviliraza.pdf
    • http://files.honeybunchbeeswax.com/uploads/1/3/1/3/131381003/479570fb5c486.pdf
    • http://files.byrdsworld.com/uploads/1/3/1/3/131382078/gibigom.pdf
    • http://files.madlyeclectic.com/uploads/1/3/1/4/131483253/nuwitoduku_xafozovininu_lekilirox_navagad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vekedexixerokasadoboma.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/noxon.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/84766987608.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9768/files/17472262568.pdf
    • https://cdn.shopify.com/s/files/1/0433/7795/0881/files/25120518569.pdf
    • https://cdn.shopify.com/s/files/1/0431/0712/3357/files/17125028360.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1644/files/45997412948.pdf
    • https://cdn.shopify.com/s/files/1/0435/3189/4944/files/jolunalod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/65339192681.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/woramopuxiroba.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_off0000597b.bin
e805823d491d491c3100e7fa3d811d8f1d4e294ecef658a034634057e7096251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x597B 4556 bytes
font_01_sfnt_off00006984.bin
9ebfa02d78785fd19b0264dde17de836f1e11b8de9d9e86db3a64adb33e4af24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6984 4816 bytes
font_02_sfnt_off000079e0.bin
c3eee0a7dbea57430c274ac6e6300d4da5cac9fbcf3c131e3f15994a2c78ec74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E0 9904 bytes

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