Malicious PDF — malware analysis report

Static analysis result for SHA-256 1533d507e7eadace…

MALICIOUS

PDF

42.2 KB Created: 2020-08-14 14:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d95c84b19befc748dcb0767c3ba3d2ef SHA-1: 641e62f2a1e0951b312605f0da3cdf47dd259619 SHA-256: 1533d507e7eadace2cfd9faba9ba19b461a2143f35e2b3e46a45829b2b31baae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=letter+format+in+microsoft+word
    • http://files.elitesportsperformanceuk.co.uk/uploads/1/3/0/7/130776518/9707390.pdf
    • http://files.halualani.com/uploads/1/3/1/0/131070611/wuritifemo.pdf
    • http://nisupen.novention.com/uploads/1/3/1/6/131637014/5700930.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/64241677165.pdf
    • https://cdn.shopify.com/s/files/1/0438/6340/8795/files/sidizejitekasebikixu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/30368304023.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5878/files/42915968878.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/bhagavad_gita_gujarati_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6060/9692/files/41794010668.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/rugelurulusudefonepana.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/bit_by_bit_salganik.pdf
    • https://cdn.shopify.com/s/files/1/0429/0940/1251/files/uc_browser_old_apk_app.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/52543453389.pdf
    • https://cdn.shopify.com/s/files/1/0430/8064/6807/files/zakadoru.pdf
    • https://cdn.shopify.com/s/files/1/0432/0716/4064/files/gananifogaxifojolimi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000681d.bin
908113a8d11e78b5f34a70c2f84be699614f751e490e076a7213521292f1b71d
pdf-font-stream PDF embedded font (sfnt) at offset 0x681D 5168 bytes
font_01_sfnt_off000079a5.bin
e108b1d257d9e52ab08da011928debdf55785329aad4cc4554afb25b96f8eade
pdf-font-stream PDF embedded font (sfnt) at offset 0x79A5 9980 bytes