Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a2521896a0c7c4…

MALICIOUS

PDF

40.2 KB Created: 2020-08-11 14:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd46b24839c1635120e99322fac3d566 SHA-1: 34bdb15358306e4879e9d02ea6edb6803ad2a003 SHA-256: a2a2521896a0c7c41ebc3f0e8d663c209e13cafaa93fe38adadf158f4fc63c3b
128 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/wb?keyword=ap%20school%20teacher%20mobile%20number%20pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The presence of a 'download button' heuristic further supports the lure mechanism. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack vector appears to be a malicious redirector disguised as a download link.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=ap%20school%20teacher%20mobile%20number%20pdf
    • http://files.chupacandelabra.com/uploads/1/3/0/7/130775046/3d52337f.pdf
    • http://files.shenteachers.com/uploads/1/3/1/4/131483685/xixubuli_foradosidi.pdf
    • http://files.kateshannon.net/uploads/1/3/2/6/132682338/5887e80fe6e.pdf
    • https://cdn.shopify.com/s/files/1/0440/4353/4486/files/kamelajexulagidekuse.pdf
    • https://cdn.shopify.com/s/files/1/0437/7562/3320/files/31045658450.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7680/files/zobonope.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/84623653465.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/48213693915.pdf
    • https://cdn.shopify.com/s/files/1/0450/4171/3310/files/cengage_chemistry_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/8062/0955/files/prefixes_and_suffixes_exercises_with_answers_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0446/8060/9945/files/dizoruwibuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4949/files/6259653038.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9118/files/migajakurekijuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5036/8152/files/zoledi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51994241049.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_off00005f3e.bin
6bc68eef7a9b759f83617bcf1298b30fdf788ac5981fdbe58e59a6b396927994
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3E 5524 bytes
font_01_sfnt_off000071d0.bin
da07eb8aa717094d4ba33adbe561f17cb3e0df4539d44c1a04a4858ee3ebf672
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D0 10040 bytes