Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a4ebd6a9fe561e…

MALICIOUS

PDF

42.5 KB Created: 2020-08-12 11:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17f21065b18fe04ae8536ab81f4157fc SHA-1: ff741b71382e93a0f2f4d4689d40c5621a9d21e8 SHA-256: 20a4ebd6a9fe561ebebaa9800e4d54fada14a0b697cc817c5b799709f4ec334d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click the malicious link, likely leading to further compromise.

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=frases+nominales+en+ingles+ejercicios+pdf
    • http://files.omsbands.com/uploads/1/3/1/3/131379037/8150706.pdf
    • http://files.thestrongfamiliescommission.com/uploads/1/3/1/8/131871909/votijaw_vemezuzatagokoz_tajolatogip_fudujed.pdf
    • http://files.mountainaircool.com/uploads/1/3/1/4/131437531/gaguziwogovav_vetatogoles_durom.pdf
    • http://files.refugecl.org/uploads/1/3/1/4/131438211/kuxelarupaxanirigi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3631/files/gikenegigomevu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8161/3987/files/zogotalubutikalo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7516/4574/files/young_jeezy_instagram.pdf
    • https://cdn.shopify.com/s/files/1/0430/9647/3749/files/ashrae_handbook_of_fundamentals_1997.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/prehospital_emergency_care_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/2707/0117/files/nike_case_study_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36149341097.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52244446143.pdf
    • https://cdn.shopify.com/s/files/1/0432/5762/6792/files/jojijelefotokesilu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9751/3381/files/wezugolukadesaxalonagugi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/fofimubuzumixupujozejel.pdf
    • https://cdn.shopify.com/s/files/1/0437/6150/0309/files/bruno_mars_count_on_me_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/dutulorajaxena.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_off000064a4.bin
9309b7aaae6f8a8b3b7224a03e3621a11c14ea1a778ad877c058f6f4485d9852		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A4 5504 bytes
font_01_sfnt_off00007750.bin
a1368300d419c09b4e2956117ca52a33251922e1dd15cc4450ca89c0ef3a4563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7750 11064 bytes

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