Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f861b0b3165486…

MALICIOUS

PDF

42.6 KB Created: 2020-08-31 11:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a3298b046dec3980e9a3837decf8395 SHA-1: 6aa6f9947d1b3614f300413b82b3b8ef0bf524f1 SHA-256: 85f861b0b31654862caa95a694c9590aa5202d1dc90229154a6d37ef202e2fea
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/wix?keyword=fairy+tail+android+game, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to a "Fairy Tail android game" and the malicious URL, suggesting a lure to drive traffic to malicious infrastructure. The presence of numerous other PDF links, many pointing to Shopify, indicates a potential link farm or SEO manipulation tactic to distribute the 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/wix?keyword=fairy+tail+android+game
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4888/5662/files/5e_oathbreaker_paladin.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6143/files/naxodajedovokuliwutikoru.pdf
    • https://cdn.shopify.com/s/files/1/0438/1035/7405/files/bapazigavuwefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0497/6548/files/bipamabodomireduno.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/92364364905.pdf
    • https://static.usrfiles.com/ugd/4826f5_efd2a1d49850422cb16b3e2eab9df885.pdf
    • https://cdn.shopify.com/s/files/1/0428/7548/6367/files/61236722577.pdf
    • https://cdn.shopify.com/s/files/1/0435/6685/8408/files/fisavidabu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4495/files/ronol.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1304/files/86447774359.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/fungsi_pendidikan_islam.pdf
    • https://cdn.shopify.com/s/files/1/0432/6345/9486/files/tolowawej.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/41484350966.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/tududevafiboli.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050f1.bin
233ac4aae05338095e618be07a3281a8645e9608befaeee28a80f2e91a0c8b6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F1 7096 bytes
font_01_sfnt_off000068dc.bin
f974c83bd0dad039ebf0e8d6ced60eb76c1084f37ff746722f33c69259b1e0da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DC 5024 bytes
font_02_sfnt_off000079dc.bin
ece601a997819f909bc2de7d265af3893ea48f6ff3ed07bd894516492fac5985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79DC 10360 bytes

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