Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31186b461089594…

MALICIOUS

PDF

41.1 KB Created: 2020-09-03 05:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebfde5d43643bc7bd1a164938557c7e6 SHA-1: a2fb2e0ecc158e0b23dd2ad52cdc9ca1894150da SHA-256: d31186b461089594f0b13fe20fa112c8a1733fe461707e430e847db1b64a0f90
154 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.me/wix?keyword=aircraft+weight+and+balance+revision+blank+form'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. The presence of a large number of external PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to mask the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=aircraft+weight+and+balance+revision+blank+form
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/61260523402.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/flomax_davis_drug_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/finding_limits_using_graphs_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/0379/5877/files/32289231847.pdf
    • https://static.usrfiles.com/ugd/529385_e9672d73046a489b885046d464587215.pdf
    • https://static.usrfiles.com/ugd/08e331_60f98db603e744e99118b5cbfe424f23.pdf
    • https://cdn.shopify.com/s/files/1/0448/0493/1746/files/algorithm_design_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/vinikozevatujizavovod.pdf
    • https://cdn.shopify.com/s/files/1/0450/5973/5704/files/renaissance_architecture_in_france.pdf
    • https://cdn.shopify.com/s/files/1/0435/5139/1907/files/gevenozanulizumog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0437/5586/4213/files/42504841845.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/cookiezi_osu_skin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.pdf
    • https://cdn.shopify.com/s/files/1/0430/2589/1479/files/ptet_college_allotment_list_2020.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_off00006227.bin
d28f91af0dc89227f6d1cdd3a1d17e5cc9838e9950c481051ae982b2379fa98f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6227 5780 bytes
font_01_sfnt_off000075bd.bin
b1adc3378cd3aa37c502e05a400a55968ebae2104050bf02c8e1361bcc812ca9
pdf-font-stream PDF embedded font (sfnt) at offset 0x75BD 9900 bytes