Malicious PDF — malware analysis report

Static analysis result for SHA-256 a830ff4c0c3e2319…

MALICIOUS

PDF

52.6 KB Created: 2020-08-23 21:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 219e0c882b8026a61863fa7bc71b0ba6 SHA-1: 0697dbc69a8a2096d291407df513e0d419bc7540 SHA-256: a830ff4c0c3e2319f220d036eb22a85313999407cb98d68e4fe98187d03648c3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'https://ttraff.cc/pify?keyword=angular+formarray+push+is+not+a+function'. Another critical heuristic identified a PDF link farm, indicating a potential SEO poisoning or spamming campaign. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the presence of the malicious redirector URL is sufficient evidence of malicious intent.

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=angular+formarray+push+is+not+a+function
    • http://dezar.citysanitaryserviceia.com/uploads/1/3/1/8/131856746/nazupobakajamo.pdf
    • http://perabew.carlosvillezfineart.com/uploads/1/3/1/0/131070719/zexevodazop.pdf
    • http://files.ericatremblayresumespecialist.com/uploads/1/3/1/0/131070001/84c81e.pdf
    • http://milebej.practicethehobbyofkings.net/uploads/1/3/1/4/131437689/bf21d.pdf
    • http://gopap.2016turkeytour.com/uploads/1/3/1/4/131453870/ded3dd1e244bf37.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1278/files/48737474579.pdf
    • https://cdn.shopify.com/s/files/1/0430/3503/3757/files/jawitigudirajomowarad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/epic_orchestral_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/calculus_2_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/6871/8232/files/learn_autocad_2007.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2346/files/history_of_avian_influenza.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7592/files/brush_lettering_practice.pdf
    • https://cdn.shopify.com/s/files/1/0452/7511/9778/files/kejolil.pdf
    • https://cdn.shopify.com/s/files/1/0429/4996/8035/files/giputojak.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_off00007196.bin
8f48dc6e0a3026e34903c154ab94ba2c178b37c568548b708ae50d0cdd7930cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7196 5284 bytes
font_01_sfnt_off00008364.bin
752d5051dead16bf85181abcab57729b6ad7ad6e08c324d925b3dc6c5684375b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8364 15784 bytes
font_02_sfnt_off0000b542.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB542 4324 bytes

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