Malicious PDF — malware analysis report

Static analysis result for SHA-256 666c8e6b4d50e235…

MALICIOUS

PDF

45.0 KB Created: 2020-07-29 02:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68debb35d691f09afb01c8bddc541961 SHA-1: a504b0585cb1831fc79b3b78a3781dd48c41e538 SHA-256: 666c8e6b4d50e235af14e91f4fb97df4bcecc4348e1d987c715300b3e600b187
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the heuristics suggest a link farm designed to lead users to malicious sites, likely for phishing or malware delivery.

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=ring+savvy+inc.+answering+legal+inc
    • http://files.curtisnewmanartist.com/uploads/1/3/1/3/131383544/pifewokowisasikelomu.pdf
    • http://files.blueridgechildrensmuseum.org/uploads/1/3/0/8/130874238/zovumix-lutorenip.pdf
    • http://files.belizelionfish.org/uploads/1/3/2/3/132302802/7889735.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/padazatizadegafodo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/mexirikamovipigor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/88238488526.pdf
    • https://cdn.shopify.com/s/files/1/0435/4477/2759/files/zadubivijivapenu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8457/1031/files/90223361306.pdf
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/dobojerixovanew.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/wemikuxiwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2838/0839/files/41109481754.pdf
    • https://cdn.shopify.com/s/files/1/0432/1158/7752/files/zixoxokigoxono.pdf
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/tawesik.pdf
    • https://cdn.shopify.com/s/files/1/0436/8164/4697/files/watizurox.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_off00007436.bin
63f48531f1a1f94078098be43aa807ba3110f5e273d186591e513c62ddaab230
pdf-font-stream PDF embedded font (sfnt) at offset 0x7436 4860 bytes
font_01_sfnt_off000084d5.bin
1ec8c12f02cc6ae040e571565ec11673e740c993769c9857fecdfc8e548070d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x84D5 10020 bytes