Malicious PDF — malware analysis report

Static analysis result for SHA-256 b254ba98a38143f0…

MALICIOUS

PDF

44.4 KB Created: 2020-08-06 06:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13e3827f49d28ea43841a1871eca0ba5 SHA-1: 8bbc3e8e40314d5082892cf0a06d7a2b5c5eb582 SHA-256: b254ba98a38143f0d29880fcfe0a7df19e8fa4ff335dee41add080022bd44ee6
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=electronic+measurements+and+instrumentation+textbook+pdf'. This indicates a social engineering attempt to lure users to malicious infrastructure under the guise of providing a textbook. The ML classifier strongly supports the malicious nature of this PDF.

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=electronic+measurements+and+instrumentation+textbook+pdf
    • http://files.totalcrane.com/uploads/1/3/2/6/132696174/5999979.pdf
    • http://files.kenziemorganphotography.com/uploads/1/3/0/7/130738912/vixiresudexojobopala.pdf
    • http://files.preferredfuturetherapy.com/uploads/1/3/1/8/131871642/vazigunuvope.pdf
    • http://files.automaticpocketdoor.com/uploads/1/3/1/4/131438216/bubegedifo_gopup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32505595602.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/tirajixuvozelokuvon.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/38066643197.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/tcpdf_html_to_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/5456/3477/files/mabixisadawapixasapef.pdf
    • https://cdn.shopify.com/s/files/1/0435/4854/1087/files/bali_indonesia_travel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/degotexeruwevurofamiwo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0429/files/69841254421.pdf
    • https://cdn.shopify.com/s/files/1/0428/9947/2550/files/ground_handling_deluxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1428/3686/files/wiferutibipepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6208/3232/files/98546779338.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/jalenisutiv.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_off00006317.bin
57a7bbc1fa0d48758cc8dd9c2ad52d924033c45ad4469bf2b6b41353f0c255ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6317 5532 bytes
font_01_sfnt_off000075c7.bin
2d35fe1b112251630f6c3e185fb4bf58c6327cea99f60afab3ca0473214b5b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C7 2116 bytes
font_02_sfnt_off00007f93.bin
eb8656b07aca5148e899efe6fb20c92cc91cdfa04790c52296bfc01e0f37534e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F93 10556 bytes

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