Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0d0218ccb5b6dc…

MALICIOUS

PDF

40.9 KB Created: 2020-08-17 02:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4c5d0199c16c13150ddb4fbda1b79f3 SHA-1: 312ddfad20aab7df5db0f65b6d44b62c6076e9df SHA-256: ef0d0218ccb5b6dce550332ddd3b456ea904e9b48905d0888431bdafd38b734f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=feline+leukemia+guidelines'. The document body, though partially corrupted, contains text related to 'Feline leukemia guidelines', likely a lure to encourage clicks on the embedded malicious links.

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.ru/pify?keyword=feline+leukemia+guidelines
    • http://files.cozykidsembroidery.com/uploads/1/3/1/4/131409170/ninebafakafekip.pdf
    • http://files.catholicnewmancenterlssu.org/uploads/1/3/0/8/130874458/miwipujowuw.pdf
    • http://bipeju.nhscompetitivedanceteam.com/uploads/1/3/1/8/131856158/6650738.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1985/files/fofekagelanada.pdf
    • https://cdn.shopify.com/s/files/1/0431/3359/9893/files/gmat_preparation_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/0449/2950/files/xisavemujisiwuji.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7991/files/conjunctions_exercises_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6437/files/dudepadobomuxum.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0994/files/crossword_answer_for_deliberate_ploy.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/vudifulawepufemomibave.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/bnf_72_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/7400/1825/files/15869372396.pdf
    • https://cdn.shopify.com/s/files/1/0431/3969/4741/files/74108200859.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_off00006364.bin
91f1b21a9bd8caa6e8ab281490bfa90b2a137dbde9d12aa4c0c8971843b5b5f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6364 5068 bytes
font_01_sfnt_off00007491.bin
37021ed82e5814ed69e2c562ef82983b4d64435bcf62ef766f71b13fcbbf1ebc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7491 10096 bytes