Malicious PDF — malware analysis report

Static analysis result for SHA-256 b657e25417fe473c…

MALICIOUS

PDF

45.1 KB Created: 2020-08-21 08:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca357e8dec9f85169f440eaf98c67676 SHA-1: 031501ab404593e5a77cc0b17392dc5f74ef3594 SHA-256: b657e25417fe473ce6039c58b76fcf09a9900411901c95b4dd8ebc8c6e2d72ab
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=insee+cement+annual+report+2018', which is also flagged as malicious. The presence of a link farm suggests an attempt to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

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.ru/pify?keyword=insee+cement+annual+report+2018
    • http://ribifefes.bigredlocksmiths.com/uploads/1/3/1/4/131453950/6f41299.pdf
    • http://xulako.jrmccormack.com/uploads/1/3/0/7/130739240/febepezuzadet.pdf
    • http://lekeme.givinghandsministry.org/uploads/1/3/1/3/131398362/2525503.pdf
    • https://cdn.shopify.com/s/files/1/0434/7320/7446/files/70421307878.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nexunalazuzifoginiwaboliz.pdf
    • https://cdn.shopify.com/s/files/1/0449/4403/1899/files/segnali_stradali_significato.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/bushnell_prime_rangefinder_manual.pdf
    • https://cdn.shopify.com/s/files/1/0441/2129/2952/files/74456774893.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/roviximupitunidesojigelil.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/31274344771.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6649/files/bescherelle_la_conjugaison_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/petexuxosulezedupemur.pdf
    • https://cdn.shopify.com/s/files/1/0437/4432/9877/files/anticoagulant_used_in_blood_bags.pdf
    • https://cdn.shopify.com/s/files/1/0435/0840/0280/files/err_empty_response.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/79721951661.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_off0000640b.bin
c163953b27b8a65f86e0e5341965fda38dee2ce125c0e3a7ca2a8165442cc6c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640B 5368 bytes
font_01_sfnt_off00007622.bin
307597f5a36c62bafc8674ea5ca112deba5c92651e1ba9e53fc7dacc32a8798a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7622 10144 bytes
font_02_sfnt_off000098ec.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98EC 4324 bytes

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