Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b5bc5fc878a06c…

MALICIOUS

PDF

50.9 KB Created: 2020-07-22 07:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9d5bb1e7fb0a174040063bc42526277 SHA-1: eb4473ca26958647db9f18fc56029951882a8f64 SHA-256: 81b5bc5fc878a06c891e9ad8f3089b570bd5f720ee23edb6787df28a208190dc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a service manual. The presence of multiple PDF links, many pointing to Shopify-hosted files, indicates a link farm strategy for SEO poisoning or distributing further malicious content. No scripts were extracted, but the heuristic firings strongly suggest malicious intent through redirection and link farming.

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/wb?keyword=hill%20rom%20isolette%20c2000%20service%20manual
    • http://files.granbytroop125.org/uploads/1/3/1/3/131398574/4de25464dcd.pdf
    • http://files.dynoprotech.com/uploads/1/3/0/9/130969242/givanimimo-basupepizebes-nefamukidu.pdf
    • http://files.octreeconsulting.com/uploads/1/3/0/7/130776483/6898513.pdf
    • http://files.basementcityproductions.com/uploads/1/3/0/9/130969896/2490830.pdf
    • http://files.singplayaudiate.com/uploads/1/3/2/6/132681144/f6d57c55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5811/9334/files/jadixopuporuwowow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51220099535.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/79035629461.pdf
    • https://ziwamol.files.wordpress.com/2020/07/96110654906.pdf
    • https://penigan.files.wordpress.com/2020/07/34338757179.pdf
    • https://nibenig.files.wordpress.com/2020/06/37336969391.pdf
    • https://bamidepe.files.wordpress.com/2020/07/vanar.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/39080467929.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/velokiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/retudovozika.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/kinunebadijizelep.pdf
    • https://cdn.shopify.com/s/files/1/0438/9024/5787/files/5451315861.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/48132039648.pdf
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/foremokilunukojogorigo.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_off00007c1d.bin
2c57c3c453ad66de02dee23ff6eea54509a0d1b27a4929b13a10af7b3d3e5fb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1D 5124 bytes
font_01_sfnt_off00008d62.bin
6015d63270a6cda9046f09a859499c23b0de6fab09f12a7d46052dcb9193f076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D62 14832 bytes

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