Malicious PDF — malware analysis report

Static analysis result for SHA-256 a030611658cc7566…

MALICIOUS

PDF

45.8 KB Created: 2020-08-06 14:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3506f3240a04c1b812dacecda6d26ff2 SHA-1: 001501acbfd9e2c3bcf87db4ce87ebf9aeaaafb8 SHA-256: a030611658cc7566641ecdbae665e62885e1a1285800e5a67db126e5ba5f714e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, many of which point to a redirector service. The primary malicious link, https://ttraff.cc/pify?keyword=phonetic+transcription+practice+pdf, is presented as a benign document, aiming to lure the user into clicking it. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the heuristic firings and embedded URLs indicate a phishing or redirection attempt.

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=phonetic+transcription+practice+pdf
    • http://vagew.susantrottpaintings.com/uploads/1/3/0/9/130969356/kuxunadov_wijulapa_zozotanawijojo_simuxuzib.pdf
    • http://files.lovingthemother.com/uploads/1/3/1/6/131606016/2389526.pdf
    • http://files.tracysistercity.org/uploads/1/3/1/1/131164476/6674535.pdf
    • http://files.crushthemarket.com/uploads/1/3/0/9/130969703/d4c937d.pdf
    • https://cdn.shopify.com/s/files/1/0439/8910/6846/files/79651281622.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/selitagolirisusapuwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/domapoxivenuvexi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1402/files/kofubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/nightmare_before_christmas_revisited.pdf
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/xufeze.pdf
    • https://cdn.shopify.com/s/files/1/0428/2246/7740/files/6195320972.pdf
    • https://cdn.shopify.com/s/files/1/0430/7353/6149/files/woxusemazugo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9383/5432/files/lozuxurugozotopelomolexub.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4993/files/rujanurisilumipan.pdf
    • https://cdn.shopify.com/s/files/1/0435/3844/8548/files/nijil.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_off00005f92.bin
26900719ca261cc6d839cb1e09276388b94c9898776058e45930735b82950df6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F92 5000 bytes
font_01_sfnt_off0000707b.bin
b0e6e34eec29d7657f8ffc5b5fe05b7f8f6133f7987ed23956c74eabcfc66031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707B 13172 bytes
font_02_sfnt_off00009bd3.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD3 4324 bytes

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