Malicious PDF — malware analysis report

Static analysis result for SHA-256 680c331bb8a95a9a…

MALICIOUS

PDF

43.5 KB Created: 2020-08-22 07:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f30922adc3a97edcfc2438bd3bcc0f49 SHA-1: 0caed3e5917ee03e285140b9a87733e6543d9dd9 SHA-256: 680c331bb8a95a9a809190125d79e259598bd43ce451e66d19849eff87fee3fe
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains numerous embedded links. A critical heuristic identified these links pointing to a redirector service, suggesting a phishing or SEO poisoning attack. The document body, though heavily obfuscated, contains text related to 'Top 5 android phones 2018 philippines' and the URL https://ttraff.cc/pify?keyword=top+5+android+phones+2018+philippines, reinforcing the lure. The presence of many external PDF links also indicates a link farm strategy.

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=top+5+android+phones+2018+philippines
    • http://pejudikaf.bexwillis.co.uk/uploads/1/3/0/8/130874134/2940160.pdf
    • http://files.varlodavenport.com/uploads/1/3/2/7/132740462/5755489.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/0392/6939/files/53727610631.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/12840262371.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6679/files/xitagiwelen.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/78720647402.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/84670121909.pdf
    • https://cdn.shopify.com/s/files/1/0431/9258/2293/files/jedatidusum.pdf
    • https://cdn.shopify.com/s/files/1/0433/6992/2714/files/34493044959.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/afrikaner_broederbond.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7581/files/83437082474.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7917/files/39368620286.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c9e.bin
63260f158ff00151b214f7d3e13f2c6bff351f46e22d12524ea0f1d24234d7d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9E 5348 bytes
font_01_sfnt_off00006eab.bin
b54ba2aa133f12ad0c7363298c17f4c7768ade7b7a8aae94825abf01b93e30dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAB 10716 bytes
font_02_sfnt_off00009358.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x9358 4324 bytes