Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cbececfcc8be65…

MALICIOUS

PDF

40.6 KB Created: 2020-08-30 13:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5a6cf201c3eb56ed32dfbe8d5f6a1e7 SHA-1: 580b028bcd57b37529f19d09da4e5dad7efe82a9 SHA-256: b2cbececfcc8be65cb243740298dfd444b8734cb615449f771e2f44f6bbecf6b
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.cc/wix?keyword=rental+lease+document+template'. The document body also contains this URL, suggesting it is intended to be clicked by the user. The PDF also contains a mass external PDF link farm, with many links hosted on cdn.shopify.com, indicating a potential SEO poisoning or link distribution tactic. The ML classifier 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.cc/wix?keyword=rental+lease+document+template
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/radeziwiwilajumigetadad.pdf
    • https://cdn.shopify.com/s/files/1/0432/2105/7700/files/bemibusebupogajufag.pdf
    • https://cdn.shopify.com/s/files/1/0450/2175/7590/files/pugixi.pdf
    • https://static.usrfiles.com/ugd/374ce0_dea1b056989d4be39f1cbd1e6d3c3581.pdf
    • https://static.usrfiles.com/ugd/eed56f_a1dd522340c6402aab427af8973a200e.pdf
    • https://cdn.shopify.com/s/files/1/0437/0815/4008/files/training_spots_maplestory.pdf
    • https://cdn.shopify.com/s/files/1/0429/1257/9747/files/evernote_download_as.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/zupadetogoderonotodenudu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9436/0743/files/wesuzini.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7901/files/9604375660.pdf
    • https://cdn.shopify.com/s/files/1/0430/0675/4970/files/57278218119.pdf
    • https://cdn.shopify.com/s/files/1/0439/0577/7832/files/82401842671.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4680/files/movimivufofaja.pdf
    • https://cdn.shopify.com/s/files/1/0462/8637/3025/files/wufazofibixiwiwifog.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_off000061d7.bin
80f2764e235813f7d8192d1f480070865d90d7200af63f3c5886be1675824d27
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D7 5128 bytes
font_01_sfnt_off00007335.bin
dc724718e0708bffbfda7089bc1eb62ca2c420b98696a797b969220d2a650611
pdf-font-stream PDF embedded font (sfnt) at offset 0x7335 10180 bytes