Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a3c7a1c29da0b9…

MALICIOUS

PDF

34.5 KB Created: 2020-08-15 13:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62386142b6badfdc8161174206c3a3be SHA-1: 6858dac555ba5922c438083f6061603583421282 SHA-256: 10a3c7a1c29da0b94ed3dc44065ccc30ed3daf0c424fa8876c6ff592176f8dd7
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure, likely as part of a phishing or scam campaign.

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=esp8266%20nodemcu%20v3%20manual
    • http://files.gbyws.org/uploads/1/3/1/4/131483019/paludizixi-pazibokadelok-xovubonavegazuz-nobuxudisapefod.pdf
    • http://files.angelsofcharity.org/uploads/1/3/0/7/130775429/8751233.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2288/3735/files/wumomonifimij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0120/8232/files/42065709902.pdf
    • https://cdn.shopify.com/s/files/1/0432/0270/7615/files/blank_calendar_may_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/konsep_caring_dalam_keperawatan.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2371/files/nomedem.pdf
    • https://cdn.shopify.com/s/files/1/0428/3292/0732/files/42769509574.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/tezojubofumi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0501/6226/files/ar_desai_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/5463/5937/files/tixinudivapedezimad.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7505/files/15787967931.pdf
    • https://cdn.shopify.com/s/files/1/0448/0460/4066/files/sony_1cf_c218.pdf
    • https://cdn.shopify.com/s/files/1/0437/0323/8811/files/48647293593.pdf
    • https://cdn.shopify.com/s/files/1/0431/4998/3901/files/43273429066.pdf
    • https://cdn.shopify.com/s/files/1/0431/4300/4322/files/norofikasejukoniva.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_off00004c5c.bin
af9997162c3efee0f29e4bf81eb0e8611315183b2dfe8630a29fb68b60082295
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C5C 5784 bytes
font_01_sfnt_off00005fef.bin
848b6ae2d5664b7e3fe5bfcac824aac6342bf8e00280f0e8cf9309e5b9a4f9a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEF 8672 bytes