Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc9112df4404bac…

MALICIOUS

PDF

52.0 KB Created: 2020-08-13 00:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0278f6d9e8891d7a52c24fd605e9808 SHA-1: 3f9397dfd3c22b02e14cf6e4529e1f99431c74ec SHA-256: 8bc9112df4404bac54ed8d220c7f71cb2a72da9056d62855ecd8d7f9db102b06
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to dating advice. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to the malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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=comment+draguer+une+fille+pdf
    • http://kufewodop.togethergolden.com/uploads/1/3/2/8/132814476/4226071.pdf
    • http://files.frcteam2881.com/uploads/1/3/1/3/131379730/8263453.pdf
    • http://files.paulwilkinselectricien.com/uploads/1/3/1/4/131453252/tininumel.pdf
    • http://files.oldportcandyco.com/uploads/1/3/1/4/131437839/nijelujufotimavuzo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/sikizugujojamewufopa.pdf
    • https://cdn.shopify.com/s/files/1/0436/3347/5737/files/ripilalasukegozubot.pdf
    • https://cdn.shopify.com/s/files/1/0450/1677/6862/files/algebraic_expressions_grade_7_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0441/files/42974848397.pdf
    • https://cdn.shopify.com/s/files/1/0432/7935/1976/files/kugafejulanemaverojufafa.pdf
    • https://cdn.shopify.com/s/files/1/0444/2020/2663/files/algebra_maths_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/cadsofttools_to_dwg_converter.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/aqa_a_level_biology_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/nolitagofajiteremiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/codex_adeptus_astartes_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/5684/8282/files/4969129110.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/zifijilirejaxepitowez.pdf
    • https://cdn.shopify.com/s/files/1/0429/9964/4314/files/chylous_fistula.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_off00008994.bin
34500eda10ea5c8175b0eee8c6d58d62f6e48ec7f2b56c1044083f7d8b1fac0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8994 5088 bytes
font_01_sfnt_off00009ac8.bin
9f131415ac0c5cf9c853a6a943a9f9a010114050e95450ca01670906652a6c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC8 12612 bytes

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