Malicious PDF — malware analysis report

Static analysis result for SHA-256 021858804a8f3b5e…

MALICIOUS

PDF

42.7 KB Created: 2020-08-22 09:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 438198265cc6bf291d6edab09a632209 SHA-1: 0b4dffbbb0a6e382d1750cffabb679b6c751042d SHA-256: 021858804a8f3b5e1ea563f0fc7a1627a1c9abfe30560ed711dcde6b81e4af2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with a critical heuristic identifying it as a redirector link farm pointing to malicious infrastructure. The document body, though garbled, suggests a lure related to a 'computer security checklist template'. The primary malicious URL identified is https://ttraff.com/pify?keyword=computer+security+checklist+template, which is likely used to redirect users to further malicious content.

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.com/pify?keyword=computer+security+checklist+template
    • http://kanepi.ciecanswers.com/uploads/1/3/0/7/130740235/0f9e0bd.pdf
    • http://files.mariamilios.com/uploads/1/3/1/4/131406153/3913734.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8683/0998/files/50443410667.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/getumokozuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/definition_of_osha_reportable_injury.pdf
    • https://cdn.shopify.com/s/files/1/0444/7269/6999/files/brche_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/debussy_arabesque_2_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3020/files/jexujunudos.pdf
    • https://cdn.shopify.com/s/files/1/0431/2236/0481/files/boiler_control_systems_engineering_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/91365120500.pdf
    • https://cdn.shopify.com/s/files/1/0431/7364/2389/files/kedikiniberij.pdf
    • https://cdn.shopify.com/s/files/1/0433/7362/5500/files/8492448190.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/comparative_and_superlative_adjectives_exercises_for_beginners.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_off00006a36.bin
c8f490b8498ac9f4414853293a5a8f941af86e299d36119cda8b435823dd59b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A36 5244 bytes
font_01_sfnt_off00007bec.bin
087fb48543a4d8bad9640e26a5f87ee6f924098bdb6689ab6bbd1181876f58b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEC 10028 bytes