Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fef1516bc33f94b…

MALICIOUS

PDF

55.5 KB Created: 2020-08-05 10:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4504605caff362b85775137bd34f91c2 SHA-1: ca6fd87b174c2d8e4f0d56ed5f05605e0f08a935 SHA-256: 0fef1516bc33f94b66ab42b73092558f8bb608570eddb1c9a060adea58a14153
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a reference to the malicious URL. The presence of many external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=diabetes+en+el+embarazo+pdf
    • http://files.simplysailing.ca/uploads/1/3/1/8/131856852/1930131.pdf
    • http://files.ezkennel.com/uploads/1/3/0/7/130776273/0d87a617d964dd.pdf
    • http://files.onebeautifulearth.com/uploads/1/3/2/7/132740852/wevanejolafuno_bojewijelukova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/international_carrom_federation_rules.pdf
    • https://cdn.shopify.com/s/files/1/0434/9673/4885/files/8378271797.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/finesokagofebagovuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8845/3533/files/nezajufoxaxerawajevuko.pdf
    • https://cdn.shopify.com/s/files/1/0435/3281/2439/files/36465892435.pdf
    • https://cdn.shopify.com/s/files/1/0432/7325/7118/files/bomepidusibovuraw.pdf
    • https://cdn.shopify.com/s/files/1/0434/3670/3900/files/brokensilenze_queen_sugar.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/positioning_strategy_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/84517300681.pdf
    • https://cdn.shopify.com/s/files/1/0439/6895/4526/files/bug_boots_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0429/0481/3721/files/18302861018.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7976/files/43909396415.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_off00009ac5.bin
c5b72b908ad6be3b0ee4ba06a36a6dba9898f11a7f348b3aa43cabae390d7de4
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC5 5376 bytes
font_01_sfnt_off0000acfd.bin
c5d0ff5fd7ca14bccf63ce87decb9aedcd57dfb2bf7d3e96b8d27e165be03a78
pdf-font-stream PDF embedded font (sfnt) at offset 0xACFD 11116 bytes