Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53cd65a06cdbefe…

MALICIOUS

PDF

44.7 KB Created: 2020-08-19 12:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 147511470374f9ee0f1f6b10ce091889 SHA-1: fe4185f6d06ab2c8223cd8195d47035f8ee94e2b SHA-256: e53cd65a06cdbefe74a800c7401597079eb00a858999908b983c9100a9c575e1
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it features a PDF link farm with numerous external links, many hosted on cdn.shopify.com, suggesting a tactic to distribute malicious content or manipulate SEO. The document body contains the URL https://ttraff.com/pify?keyword=best+arcore+apps+for+android, which is also listed as a malicious redirector.

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=best+arcore+apps+for+android
    • http://files.siglersprinting.com/uploads/1/3/0/8/130813821/7b6a823b.pdf
    • http://sedudo.valeriecizek.com/uploads/1/3/0/7/130776208/141527.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2501/files/6682244737.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9663/files/auto_repair_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/edit_file_pages_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/0890/9734/files/53206500737.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/sokewikaxozifi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/semigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/nivirafijotutilirularuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0301/8392/files/rasozamujarizetedasewejuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/3759/6575/files/black_ops_3_cheat_codes_ps4.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/65949357342.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/dewuxopolavobewupozi.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_off000070c5.bin
347d0a119aabedb06040ecf6888df8abcf537d6180deacc1c97d0b5bd891f47a
pdf-font-stream PDF embedded font (sfnt) at offset 0x70C5 5164 bytes
font_01_sfnt_off0000825f.bin
e2326c2b8d114c148627b31bb9c0db69c930e2e1011e6b7931144ba172db106d
pdf-font-stream PDF embedded font (sfnt) at offset 0x825F 10524 bytes