Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b75fc76c8deb493…

MALICIOUS

PDF

40.1 KB Created: 2020-08-04 00:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b28cf42f27981622bf62b6ab24d75f5 SHA-1: e0f92a74884cea90e63053a21bd71345fb7f62d5 SHA-256: 8b75fc76c8deb493ceb67102b361920cae64b286a74e2d6c881ab5e1a2f99012
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. The document body, though partially corrupted, suggests a lure related to academic material ('Algebra linear equations worksheet pdf'). The presence of a large number of external PDF links, many pointing to Shopify domains, indicates a potential SEO poisoning or link farm strategy 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=algebra+linear+equations+worksheet+pdf
    • http://files.therollupcrepe.com/uploads/1/3/0/9/130969633/937707.pdf
    • http://files.lakeshoremiddleschoolpto.org/uploads/1/3/2/6/132683017/6e9e21c5312a0c7.pdf
    • http://files.playtherapyworks.com/uploads/1/3/0/7/130775639/pupogajuxur-noxafa-binemanim.pdf
    • https://cdn.shopify.com/s/files/1/0427/4946/0636/files/lafolotimusofevezaruziwel.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/66005236514.pdf
    • https://cdn.shopify.com/s/files/1/0440/2518/4421/files/667268406.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/99938071007.pdf
    • https://cdn.shopify.com/s/files/1/0431/2501/4684/files/85122048858.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/mamudutudonumasigenivokor.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7202/files/denikupugisavuliseluxiro.pdf
    • https://cdn.shopify.com/s/files/1/0435/5080/2081/files/rubalomawifokove.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/bijaxeravuxomifeninek.pdf
    • https://cdn.shopify.com/s/files/1/0437/1434/7160/files/amazing_grace_piano_vocal.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/jupomerokuxuguba.pdf
    • https://cdn.shopify.com/s/files/1/0432/6254/1982/files/tatsumi_dragon_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/roxodewoxubegajom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.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_off00005e57.bin
56d9ea806d7c73c87af28097a411f24f5def54e129c9338136737449a56d9aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E57 5712 bytes
font_01_sfnt_off000071c8.bin
1474320a3ee7a0c3ae19d47ef190e0c8972a6f08e701800b183343f76419b202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C8 9768 bytes

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