Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdb722990ddf168…

MALICIOUS

PDF

43.0 KB Created: 2020-08-21 19:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d51ffb221c4e97caf6ea79907c87f2a1 SHA-1: 3122f73a42155b1b149bc53713a91316c2a8d93d SHA-256: 6cdb722990ddf16828ec69dc594080d612601583f06efba193200e42bc68a0fd
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to distribute traffic. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=calcifying+odontogenic+cyst+case+report
    • http://bededopis.tetonhoopingcontingency.org/uploads/1/3/0/8/130813840/fawigabuzub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4484/7261/files/muruf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7074/9861/files/animal_names_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7668/files/12569423913.pdf
    • https://cdn.shopify.com/s/files/1/0437/7778/6018/files/98479883176.pdf
    • https://cdn.shopify.com/s/files/1/0434/3414/7989/files/tipovoduwem.pdf
    • https://cdn.shopify.com/s/files/1/0430/7261/8657/files/34141339600.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/xobepuvuvo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4138/2812/files/46623978473.pdf
    • https://cdn.shopify.com/s/files/1/0432/0867/1394/files/jadadifebaboliros.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/emotional_love_videos_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5548/0981/files/81988168445.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8114/files/16517380907.pdf
    • https://cdn.shopify.com/s/files/1/0448/6466/7810/files/adjectives_word_order_worksheets.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_off000068f8.bin
a6c859d7b42b1330d1c8ae90070230301dbbae53a8c8c58b9107a6d48e687fe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x68F8 5328 bytes
font_01_sfnt_off00007b2e.bin
44f89ccd5d744a45bbe37a5826359c9cbfeaeda9dbb6527dad1d0bf36e894943
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2E 10432 bytes