Malicious PDF — malware analysis report

Static analysis result for SHA-256 851a5b36bd789f78…

MALICIOUS

PDF

43.3 KB Created: 2020-08-14 13:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a06f52611cca636abbde6c33f0e124d0 SHA-1: e1affc26081f4bcdfcf17a3c29e6fbde7dcc396a SHA-256: 851a5b36bd789f78ce36f1b0be2d30e155818c23ab6a0f3fbe101d0a974ec4a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, with one identified as a malicious redirector. The document body, though obfuscated, suggests a lure related to a 'publisher author agreement form'. The presence of a malicious redirector and a large number of external links indicates an attempt to direct users to potentially malicious websites, likely 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=publisher+author+agreement+form
    • http://files.discoverycdtech.com/uploads/1/3/1/8/131871992/f2b4e60cce3.pdf
    • http://files.echolightaussies.com/uploads/1/3/1/0/131070689/sugasi.pdf
    • http://xoturun.d8cre8.com/uploads/1/3/1/8/131856190/bikivovilumefom.pdf
    • http://files.suderve.com/uploads/1/3/1/4/131438241/6399523.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1677/4054/files/ziduvokimogetuxelaga.pdf
    • https://cdn.shopify.com/s/files/1/0430/9273/8201/files/powepebas.pdf
    • https://cdn.shopify.com/s/files/1/0437/3066/5637/files/22374320812.pdf
    • https://cdn.shopify.com/s/files/1/0452/2446/0445/files/gutitonezenas.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7884/files/bobinado_de_motores_electricos_rosenberg.pdf
    • https://cdn.shopify.com/s/files/1/0449/6785/4248/files/design_and_analysis_of_algorithms_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/esv_study_bible_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1762/files/29902380153.pdf
    • https://cdn.shopify.com/s/files/1/0449/9727/9908/files/wordly_wise_3000_book_5_lesson_19.pdf
    • https://cdn.shopify.com/s/files/1/0428/3331/3958/files/verklarende_afrikaanse_woordeboek.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/counting_atoms_worksheet_answers.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_off00006a99.bin
bddd0e2f86599bca95c009f9fcc094bb22dc642a15fc0d73178da3b5af8fa25c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A99 5320 bytes
font_01_sfnt_off00007c85.bin
dee9607712de7a0b1ba1cc2a9d9415b535dd6c80717bd3064f6b1f47543925ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C85 10312 bytes