Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c5739cadb4b1ca…

MALICIOUS

PDF

62.7 KB Created: 2020-08-09 04:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f562f9346b335b8d520c086f285e6e8e SHA-1: 9223f4ab7cd84c1269d6d7c727c6c6441edb1923 SHA-256: 30c5739cadb4b1ca97e624909a23db5c4ebd004226e2a45a5912f6b4a42df9e9
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains a reference to the malicious URL. The presence of numerous external links, many pointing to shopify.com, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicates 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/pify?keyword=renograma+con+captopril+pdf
    • http://files.studiobox.co.nz/uploads/1/3/2/6/132681443/102261364e6874.pdf
    • http://files.ritosrepellant.com/uploads/1/3/2/7/132740214/zonazumarisosoz-jopolobipal-jurijirozum-tafevibukuju.pdf
    • http://files.arnhemfallenangels.nl/uploads/1/3/1/6/131636719/4222789.pdf
    • http://files.sankofaoutreach.org/uploads/1/3/1/1/131163683/juvilezun_ralojareri.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/automating_the_boring_stuff_with_python_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/4088/2343/files/zipuzunazojagabimex.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4693/files/43373521470.pdf
    • https://cdn.shopify.com/s/files/1/0431/6286/1730/files/7890697179.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gevuruliwineda.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/minedabirazo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54344474436.pdf
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/47601948008.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/1090666931.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0434/7022/5574/files/national_security_agencies_act_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/wijetekifufidosujobizemid.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4557/files/dynamics_of_machinery_airwalk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab21.bin
4f72e0f257ce5c88a9a2603e9a088a9dc282828fdc6a0d7a598f506a1269a5db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB21 5092 bytes
font_01_sfnt_off0000bc58.bin
7340f05ce19ed827c78eeac076764f704ecd17b67de5d5c961c9d34de5ef1fa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC58 10256 bytes
font_02_sfnt_off0000df29.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 4324 bytes

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