Malicious PDF — malware analysis report

Static analysis result for SHA-256 b315f4c47614b733…

MALICIOUS

PDF

48.6 KB Created: 2020-08-19 02:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 096498aaa4959f8231c126b623896a2c SHA-1: 80f647a3065b0fab6d7ba6337e4865efbc481ef2 SHA-256: b315f4c47614b733bc1d65ee8f58a736a49507dcdb44c4b9c94660395a841549
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'ttraff.com'. The document body, though partially corrupted, contains text suggesting a lure related to 'Android studio first app c++'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted from this sample.

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=android+studio+first+app+c%252B%252B
    • http://files.americanexport.info/uploads/1/3/1/6/131606502/xopeno.pdf
    • http://zafuf.gazetteevents.com/uploads/1/3/1/4/131438477/sebepa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2549/7239/files/18951752338.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bugasodaliza.pdf
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/radijilusajeka.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/wolukomaneki.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/53992653946.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0137/files/68807809487.pdf
    • https://cdn.shopify.com/s/files/1/0450/2755/7526/files/nsfas_bursary_application.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/craftsman_manuals.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_off000080fa.bin
4ce804c2eee0a4560c33781acd99200d716fc09e40e92a2f32526c5ca2ac42ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FA 5104 bytes
font_01_sfnt_off00009262.bin
8b3c7b60743c018efe12c2466ecf87a0aff31dd711614f4ea47363f6a5d680ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9262 10420 bytes

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