Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d798a2afea45ea9…

MALICIOUS

PDF

47.7 KB Created: 2020-08-24 10:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 315c48f6ce72eb9f4723ef3c0a19b86c SHA-1: f8a36a6b1e8fe7184f39607c0344996cdafba7ef SHA-256: 9d798a2afea45ea997ac1d4cffec72d8167a1e26dc04a3df82121352bd99331d
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector service (ttraff.com) known for malicious activity. The document body itself contains garbled text but includes the URL that triggered the redirector heuristic. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through a link farm to a malicious redirector.

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.com/pify?keyword=after+action+report+template+ppt
    • http://files.faubionchoir.com/uploads/1/3/2/3/132302993/dibodaj.pdf
    • http://bixigemow.combatveteranswithptsd.org/uploads/1/3/0/8/130873863/lasavolemit.pdf
    • http://files.familieswhotech.com/uploads/1/3/2/8/132814166/4b3b66770bb7c9.pdf
    • http://files.sarahbaptistart.com/uploads/1/3/0/7/130775528/towojixomuba_jesozik_mepujevawaw_zokujutojunit.pdf
    • http://files.maeflowerfarms.com/uploads/1/3/1/8/131856743/7450f8.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4702/files/definition_of_economics_by_different_economists.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/metabolism_anabolism_catabolism.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/1983066502.pdf
    • https://cdn.shopify.com/s/files/1/0433/5055/6821/files/kepesopenozipefuremekunig.pdf
    • https://cdn.shopify.com/s/files/1/0431/1082/6146/files/difference_between_capitalism_and_communism.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/79265304831.pdf
    • https://cdn.shopify.com/s/files/1/0463/2598/9531/files/83996287334.pdf
    • https://cdn.shopify.com/s/files/1/0431/1053/1233/files/ielts_test_reading.pdf
    • https://cdn.shopify.com/s/files/1/0432/8285/8144/files/guided_archery_elk_hunts_oregon.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/44716605391.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000708f.bin
0b2eb765e218ffd3381d453af6d50d767305dbc523297520d435b467659f0389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708F 4760 bytes
font_01_sfnt_off00008093.bin
2338ffef21479c4cb156f7405c8decf5a06bef8428755344e868a72c9cc9cd53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8093 10352 bytes
font_02_sfnt_off0000a3fe.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3FE 4324 bytes

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