Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dd7f018104d9f4…

MALICIOUS

PDF

47.7 KB Created: 2020-08-23 20:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1ce48ffd4f4025ba13f2d185e70033f SHA-1: cac0bdf98b461e9533842661cac63541b514d954 SHA-256: b0dd7f018104d9f4ffd14728fc13fa0510b401967577e10704244da893aca647
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=ibps+clerk+exam+preparation+books+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The document body also contains this URL, reinforcing the lure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious 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.cc/pify?keyword=ibps+clerk+exam+preparation+books+pdf
    • http://gegigejem.offroadandoutdoor.com/uploads/1/3/1/1/131164250/defadedule.pdf
    • http://files.landscapingtreela.com/uploads/1/3/1/6/131606492/rowagabufivuz-gafiw-wifowut-korebixobaxivi.pdf
    • http://files.numeroo.com.au/uploads/1/3/0/7/130775145/f060f971ae3ab5.pdf
    • http://files.sammyreid.com/uploads/1/3/1/3/131384424/bf925aa8.pdf
    • http://files.maplesyrupsupplystore.com/uploads/1/3/1/3/131398010/5581011.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0441/files/24896390073.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/1638830216.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/xasunupuromubodibezividem.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/kimubopowenubi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/fire_report_colorado_springs.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4632/files/rekulatig.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/49643749276.pdf
    • https://cdn.shopify.com/s/files/1/0454/0271/8376/files/podedabub.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/tutewidatipexobu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1995/1513/files/5e_critical_hit_table.pdf
    • https://cdn.shopify.com/s/files/1/0441/3816/8472/files/amoebiasis_treatment.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_off000073ea.bin
f1dce0370589c973c7c2a58af0be9fa41e9c25ef34ed358f350418c5fa805903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EA 5512 bytes
font_01_sfnt_off00008683.bin
e07f2063dff7e9144d4804b9c1d4cb7e2c4c3789a0980c1f2da5522b60646cef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8683 13624 bytes

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