Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c52d4a69a574d37…

MALICIOUS

PDF

42.1 KB Created: 2020-08-14 11:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2f9434385f0d7fadcd0b2c07386f29a SHA-1: a0abac9b10a8b44509a3eb4ada64fec09cd1db9a SHA-256: 8c52d4a69a574d37faf75f9f2da2a1306d5665e4dc0cd4628847a01a22b8917c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=camscanner+software+free'. This URL is likely used to redirect the user to a malicious site. The document body also contains this URL and other embedded URLs, suggesting a lure to download or view content, which is a common phishing tactic. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm designed to attract traffic.

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=camscanner+software+free
    • http://files.aclickawaytraining.com/uploads/1/3/2/6/132683014/1135131.pdf
    • http://files.windsweptpoodles.net/uploads/1/3/0/8/130813646/fikolatofike_nikuso_zuluvebabiwe_zasurivope.pdf
    • http://files.cvpsecurity.com/uploads/1/3/2/7/132740692/2673850.pdf
    • https://cdn.shopify.com/s/files/1/0437/5347/2151/files/c20_concrete_mix_ratio.pdf
    • https://cdn.shopify.com/s/files/1/0454/2916/2152/files/java_advanced_thread_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49839171509.pdf
    • https://cdn.shopify.com/s/files/1/0434/5305/5128/files/79750925303.pdf
    • https://cdn.shopify.com/s/files/1/0431/0325/6737/files/94948548739.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/76430619508.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/wososizajupatunafemibiki.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/40868264839.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6826/files/galvanic_corrosion.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/98958890382.pdf
    • https://cdn.shopify.com/s/files/1/0434/8172/7129/files/6216726489.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/sofixitavu.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_off00006718.bin
da228239378343f80251374b6a3a90bf897cc799695b8a2185ea9fa0cc08c1cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6718 4992 bytes
font_01_sfnt_off00007809.bin
da0a47e3c1806eae8a98fcdb36cdd67d85eb4eb6bbbde18f7896aa9d1ce8a08c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7809 10528 bytes