Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b84243dee38068…

MALICIOUS

PDF

42.2 KB Created: 2020-08-14 08:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2e4867035cf373c133ec4829fcf7d96 SHA-1: 7dbd76b35f095cd510f1e426ed66e0dd9dfe43e3 SHA-256: 24b84243dee380686ffb1e09ef2f6da28f355f5e6e8032d91ba496d64177c2b0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=run+android+apps+on+mac+2019'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through these links, likely to a malicious site or for further exploitation.

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=run+android+apps+on+mac+2019
    • http://files.miss-strench.net/uploads/1/3/2/6/132681749/37fbbe62173.pdf
    • http://files.northumberlandhispanic.ca/uploads/1/3/1/4/131407089/gavipad.pdf
    • http://files.honeycombloom.co.uk/uploads/1/3/0/8/130815228/2cbf3a83.pdf
    • https://cdn.shopify.com/s/files/1/0444/2423/3126/files/dictionnaire_de_l_argot_francais.pdf
    • https://cdn.shopify.com/s/files/1/0440/1129/0782/files/12844591032.pdf
    • https://cdn.shopify.com/s/files/1/0431/4310/2618/files/59197169194.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/46155191212.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/adverb_clause_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/82219997957.pdf
    • https://cdn.shopify.com/s/files/1/0436/7558/2617/files/webole.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/58689198506.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/41624987752.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/14816034696.pdf
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/81684491057.pdf
    • https://cdn.shopify.com/s/files/1/0435/0921/9492/files/luxes.pdf
    • https://cdn.shopify.com/s/files/1/0437/8230/7989/files/60972428707.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_off00006680.bin
673d12ba6ff4884b8ff3a6d12f4b0876eaaf58637f17d47560dd3ea1dd815f5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6680 5676 bytes
font_01_sfnt_off000079b4.bin
a703d97c848d63db999d1d2d84bb67836844001d4b7ee545ddb069b1ebe9641b
pdf-font-stream PDF embedded font (sfnt) at offset 0x79B4 10064 bytes