Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3aca2cc20100e44…

MALICIOUS

PDF

39.1 KB Created: 2020-08-09 03:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 262085a3ca31b2fd96d412830f4337e2 SHA-1: 3d357f40cf2d13cb6144a1eeddee7b99ed08c4d8 SHA-256: d3aca2cc20100e4447e60e65f82bb2f5f64f05e3ea42f93c10ef1e3cb443a809
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though partially corrupted, includes the target URL and other PDF links, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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.ru/pify?keyword=occupational+therapy+in+community+based+practice+settings+pdf
    • http://wetorog.opmustang.com/uploads/1/3/1/4/131437886/suraxaxogopikoj-medokaxogun.pdf
    • http://vopib.doryclub.org/uploads/1/3/1/3/131383483/cce6de63c1b1.pdf
    • http://files.startimepatisserie.com/uploads/1/3/1/6/131606046/rosufiwu.pdf
    • http://files.angieblakemore.com/uploads/1/3/2/6/132681391/5669215.pdf
    • http://rolid.cashatmservices.com/uploads/1/3/1/4/131453133/kuxutel-mobununuruva-tuwudilafugupo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5100/5590/files/effective_academic_writing_1_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0436/2518/5442/files/naruto_shippuden_episode_86_english_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/kitamukazugubatewilu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/65356095259.pdf
    • https://cdn.shopify.com/s/files/1/0434/1317/6469/files/katofuvetux.pdf
    • https://cdn.shopify.com/s/files/1/0432/3436/1503/files/52226543075.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2783/files/heat_conduction_equation.pdf
    • https://cdn.shopify.com/s/files/1/0430/7507/6258/files/44888202338.pdf
    • https://cdn.shopify.com/s/files/1/0437/1863/9765/files/lion_king_circle_of_life_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/2215/5930/files/widanutonig.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3383/files/battle_bears_gold_accounts.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/zewexizomikiwaxag.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_off00004b7d.bin
841149a4beeb36271924b2a3d6eaf82ce7253a131e43991fa5996d4069189ea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B7D 5720 bytes
font_01_sfnt_off00005ebc.bin
fa2bc9e86710b3976a084b47710e9575967559e6a81f21878645573b58a2e717		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBC 9944 bytes
font_02_sfnt_off000080ba.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BA 4324 bytes

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