Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcd76588598ad4a…

MALICIOUS

PDF

60.3 KB Created: 2020-08-31 03:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 080449c01b0d39ec3d128249aba25e0c SHA-1: c082fb4ef46e9a13c4d7a40b6c99387241b72e0f SHA-256: fdcd76588598ad4a435f8a122e24acded07e9c95c15fbb6e5bf52df1507ca06d
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a reference to 'Pokemon ruby version cheats' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=pokemon+ruby+version+cheats
    • https://cdn.shopify.com/s/files/1/0462/2925/8389/files/62537044931.pdf
    • https://cdn.shopify.com/s/files/1/0432/2679/2093/files/72230016638.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8172/files/fisanisujobagegenuboz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/lonogu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5347/2151/files/calculus_early_transcendentals_6e.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/goxerasa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0813/files/buffer_solution_problems.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/69890840640.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2485/files/53582368469.pdf
    • https://cdn.shopify.com/s/files/1/0432/8846/1478/files/jenis_jenis_alelopati.pdf
    • https://cdn.shopify.com/s/files/1/0433/4115/2406/files/bewemuxadel.pdf
    • https://cdn.shopify.com/s/files/1/0434/2883/9586/files/comment_runir_plusieurs_en_un_seul_avec_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0433/4954/1013/files/rainforest_animal_adaptations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/bufeterigirijarepole.pdf
    • https://cdn.shopify.com/s/files/1/0431/5217/9364/files/94204347165.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_off0000a07f.bin
0e0c2f303e1e931273ff6f5280c16d61ea8fe74a0ba10f864db5eabdcdd50e35
pdf-font-stream PDF embedded font (sfnt) at offset 0xA07F 5376 bytes
font_01_sfnt_off0000b2a3.bin
3cdeb978b1d7cc19a19bbcc42b3a7be3553bd3e735f843bddc8bfb632216851c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A3 15788 bytes