Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d11aca1f94a5b0…

MALICIOUS

PDF

40.4 KB Created: 2020-09-01 17:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecc28dbc0233e5ef99abe7032696ab51 SHA-1: f22227341666ea43b6a3a12633fb66d6697bc09f SHA-256: c4d11aca1f94a5b063a651fcf079f0e358a9505c86843e6b225c5cefc8cab7e1
154 Risk Score

Malware Insights

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

The PDF was flagged for containing malicious redirector links and a link farm. The primary malicious URL identified is https://ttraff.cc/pify?keyword=toyota+corolla+verso+2008+manual+pdf, which is likely used to funnel users to further malicious content. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be a lure for a manual PDF. The ML classifier strongly supports the malicious verdict.

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=toyota+corolla+verso+2008+manual+pdf
    • https://cdn.shopify.com/s/files/1/0440/6116/3670/files/asustor_as4002t.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/79428617573.pdf
    • https://cdn.shopify.com/s/files/1/0429/9046/9283/files/soda_compressor.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/rollerblades_at_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0447/0338/3708/files/rent_lease_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/44972050390.pdf
    • https://static.usrfiles.com/ugd/ab059d_adc020f9515643bfb2dd314c22225f08.pdf
    • https://static.usrfiles.com/ugd/3b47cb_b7a502b60500442fa553266b97396314.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9752/files/caderno_de_caligrafia_para.pdf
    • https://cdn.shopify.com/s/files/1/0432/7564/9180/files/58948794645.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/criticism_of_democracy.pdf
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/customer_survey_analysis_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/asterix_y_los_pictos_gratis.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_off00005d97.bin
4e6959842c6253a09e45b1f0bae2e5c604f83a62e0f6e8fa89c8a5161656ed77
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D97 5880 bytes
font_01_sfnt_off00007191.bin
9636c410c6c249d7c616c22fe8bceffe1cab088b06c582855c140568de979593
pdf-font-stream PDF embedded font (sfnt) at offset 0x7191 10272 bytes