Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d92f0a4d294165a…

MALICIOUS

PDF

36.5 KB Created: 2020-08-24 23:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b6d1f33f1f64b38fdcaa00f15e0c8f2 SHA-1: 7102bff6ed4130666f13776c3fbc31852dcde435 SHA-256: 4d92f0a4d294165ad4ffb06a0dc35bda9e76cc7cb6fe109b0ca6fd152146ac0a
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a ttraff.com URL identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'Best blank meme templates' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful infrastructure.

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=best+blank+meme+templates
    • http://files.color4home.com/uploads/1/3/1/4/131438044/boribubimiserime.pdf
    • http://files.theburgershackpa.com/uploads/1/3/1/4/131453858/zoserilusimu-femawofevowewor.pdf
    • http://files.msminasbodycare.com/uploads/1/3/0/7/130775320/velilixebetebuz_jusutugo_lobinodikopituz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6327/0815/files/27494950607.pdf
    • https://cdn.shopify.com/s/files/1/0434/2874/1285/files/atmsfera_primitiva.pdf
    • https://cdn.shopify.com/s/files/1/0430/3575/4650/files/51483126580.pdf
    • https://cdn.shopify.com/s/files/1/0454/7405/4310/files/telexawaduxegiwenebebix.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/19144329599.pdf
    • https://cdn.shopify.com/s/files/1/0428/7745/2454/files/5121410789.pdf
    • https://cdn.shopify.com/s/files/1/0435/2950/2874/files/82085616058.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/98600106987.pdf
    • https://cdn.shopify.com/s/files/1/0436/4166/7734/files/what_is_convenience_sampling.pdf
    • https://cdn.shopify.com/s/files/1/0431/5706/1781/files/lupukemuteso.pdf
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/dead_sea_scrolls_translated_into_english.pdf
    • https://cdn.shopify.com/s/files/1/0438/4810/6134/files/ielts_reading_files_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/after_official_trailer.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_off000051eb.bin
f390b3863094b3ac304529eca9350526e7257346ea9d432a97dce3b5b4cae30b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51EB 5120 bytes
font_01_sfnt_off00006346.bin
f5ea57d63764bb4bd8dd54c6344888093a60cfa3b63c086d7dc66a2899d63ef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6346 10192 bytes

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