Malicious PDF — malware analysis report

Static analysis result for SHA-256 190b856180f53505…

MALICIOUS

PDF

48.8 KB Created: 2020-08-03 03:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c725b68b722f0644240cbd629df5119 SHA-1: f40279f8ab171b90f3f7834d45974e519e7d372c SHA-256: 190b856180f53505ba9eab5d7bc7455cb5b54a57fcf498bc5cf03c45a2883a7d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a significant number of embedded links, many pointing to external PDF files hosted on various domains, including a known malicious redirector. This suggests a link farm or SEO manipulation tactic, potentially used to distribute malware or phish users. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL is a high-priority indicator.

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=c+hash+table+implementation
    • http://files.cheerproathletics.com/uploads/1/3/1/8/131856827/gamifalesopa.pdf
    • http://files.hocrane.com/uploads/1/3/0/8/130814652/matawuwovi_guridof.pdf
    • http://files.fenwaywestfield.com/uploads/1/3/2/7/132740350/5077484.pdf
    • http://files.spearfishspartanwrestling.com/uploads/1/3/1/3/131381414/822423.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/91772188755.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/xoribasuwoke.pdf
    • https://cdn.shopify.com/s/files/1/0432/0188/8416/files/datifulumologekojaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/talidimakujonexixolo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/47038885649.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5031/files/wiragazirugitinuriwuvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8988/files/stardew_valley_path.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/11925323780.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/9859382866.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7317/files/56731704608.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/gubemobolizinezaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/zumajosaxetizoxiz.pdf
    • https://cdn.shopify.com/s/files/1/0436/7410/8057/files/woxusoraloxef.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007426.bin
ceed1acabe66e863e64f706c597d86aef9d636174b9dfc19428faadaa892ccf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7426 5008 bytes
font_01_sfnt_off000084ff.bin
7ff9dcff0220a74d23d9365fa22eaa5ce340602fa342e292381efa8007368af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FF 15644 bytes

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