Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09fdec6aa790571…

MALICIOUS

PDF

62.9 KB Created: 2020-08-10 23:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0d690cb3a30ec2e0fbae3e0b594456e SHA-1: f2fa461760e10e6cdfb13ee5425b3aecb567dbd4 SHA-256: d09fdec6aa79057110120e356f023b960106bd9e73dcfee1483aea0b489da550
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a redirector service, which is a common tactic for delivering malicious payloads. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malware. The document body, though heavily obfuscated, contains the malicious URL.

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=contemporary+cephalometric+radiography+pdf
    • http://files.marvinleblanc.com/uploads/1/3/2/7/132740814/2969529.pdf
    • http://files.uabiochemistryclub.com/uploads/1/3/1/0/131069781/babulonazavi-wunope.pdf
    • http://files.rpsings.com/uploads/1/3/1/6/131606003/335d86abe42a33d.pdf
    • http://jopopiso.altofrio.com/uploads/1/3/1/4/131454065/weragisuvibis_manaxebosumate_kosilanakipiko_zirudopozoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2104/0789/files/formulation_and_production_of_carbonated_soft_drinks.pdf
    • https://cdn.shopify.com/s/files/1/0431/0607/4778/files/benzetacil_bula_anvisa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7762/3194/files/wivibulez.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4556/files/acer_x118h_projector_specs.pdf
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/aws_solution_architect_certification_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/8031/9130/files/breast_cancer_review_article.pdf
    • https://cdn.shopify.com/s/files/1/0430/8320/2711/files/35614713655.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/all_formula_of_maths_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0449/9626/4094/files/warrior_bis_classic.pdf
    • https://cdn.shopify.com/s/files/1/0436/0385/3476/files/25148936456.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/fovuxojufaxotivimupa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/depolumav.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/79033155643.pdf
    • https://cdn.shopify.com/s/files/1/0437/5180/0981/files/49121367594.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_off0000b7ac.bin
b149e4736bab809cdaa901f282940cfe9cc7c2ada8f01d25be3d8964ba3c4f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AC 5400 bytes
font_01_sfnt_off0000c9dc.bin
03b5540582cdf2110e9190803ef63480658ace74b1f86d753c5f18133d915672		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 10588 bytes

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