Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0281d5ab9682e67…

MALICIOUS

PDF

34.3 KB Created: 2020-08-23 13:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29571e1c5431bfb76cd80e96d26ae20d SHA-1: 24a3f1c8bfea07ff222bd707d0ca87103b85f00f SHA-256: a0281d5ab9682e6724db7cf053980235acb21e6f3f46a8f3c70fa5c47d2cc475
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=rye+beach+new+hampshire+surf+report`. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on `cdn.shopify.com` and other domains. The document body, though partially corrupted, contains the same lure text and URLs, suggesting a coordinated effort to drive traffic to malicious or SEO-spamming sites. The ML classifier strongly supports the malicious verdict.

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=rye+beach+new+hampshire+surf+report
    • http://madodi.semohpalumni.org/uploads/1/3/1/4/131438405/a248c6801c2cfd.pdf
    • http://xebebifag.hockeyaustralia.net/uploads/1/3/0/7/130775797/rivakipezatifesolu.pdf
    • http://files.fatzip.com/uploads/1/3/1/4/131407278/dokiwivajiwudob.pdf
    • http://gipofawa.undralandskennel.com/uploads/1/3/0/9/130969204/vejanekegurexur.pdf
    • http://vaxeli.honesthomeinspector.com/uploads/1/3/1/0/131070197/8dcb1.pdf
    • https://cdn.shopify.com/s/files/1/0431/4978/7285/files/caballo_de_troya_ii.pdf
    • https://cdn.shopify.com/s/files/1/0458/3289/6675/files/deberatab.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6469/files/48490525910.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53151925343.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/45799751723.pdf
    • https://cdn.shopify.com/s/files/1/0438/4037/2896/files/adobe_reader_free_download_for_windows_8_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4908/files/weboxakarofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0123/3053/files/58899894792.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_off000046ba.bin
30f10fc9a78d8ecc878845872120b82a54c9edc2eebaff0d157a752c5ce9609c
pdf-font-stream PDF embedded font (sfnt) at offset 0x46BA 5564 bytes
font_01_sfnt_off00005988.bin
13b0659e3c4a929341172fba214e06c7cc266d55e6215e421d8fa8b2c65559b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5988 10204 bytes