Malicious PDF — malware analysis report

Static analysis result for SHA-256 696f9c8ff046159f…

MALICIOUS

PDF

46.2 KB Created: 2020-08-05 18:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11614535bf9ea451ef865bea77935bcc SHA-1: ffa8e817e6b70be1ca39cf15cb0b065110a22dc3 SHA-256: 696f9c8ff046159ffcdeb27160a7ba3cb288c803869fbc850846e6eb6d3524f2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service, which is a common tactic for distributing malware or phishing pages. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a link farm designed to appear as legitimate PDF downloads, but the primary malicious URL is the 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=acls+guidelines+2020+pdf+download
    • http://files.cottonginmuseum.com/uploads/1/3/0/7/130776152/e1ea37e.pdf
    • http://files.squamishyouthrugby.com/uploads/1/3/1/4/131483249/limanoki-furuwufixodin-jogefasukaserem.pdf
    • http://jagarup.cgapak.org/uploads/1/3/0/8/130874474/bomamukonut.pdf
    • http://files.gloryshinersministries.org/uploads/1/3/0/9/130969472/xutidopixuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6497/files/38086642342.pdf
    • https://cdn.shopify.com/s/files/1/0435/5103/1464/files/16400638657.pdf
    • https://cdn.shopify.com/s/files/1/0446/4974/2499/files/pdf_marketing_digital_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/66564358737.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/92835592029.pdf
    • https://cdn.shopify.com/s/files/1/0428/7925/4694/files/xasipa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/brew_install_yarn.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/61467206542.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/14404134443.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/voseve.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7454/files/5042432178.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006683.bin
a58222d0551e35781c1aaef18e4e4905f7104299ffd8d074bbd480ac71c4a943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6683 5384 bytes
font_01_sfnt_off000078ee.bin
ea729560b92ac71836cad7f1bc12e71c1a27df927f2216d7e8784dc6b7b5f483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EE 10936 bytes
font_02_sfnt_off00009dd5.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DD5 4324 bytes

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