Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b139e6b28a95687…

MALICIOUS

PDF

37.8 KB Created: 2020-08-11 20:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1834d9b723d66f3500fa0371b5f0fce2 SHA-1: 299835cd15ffe22a8065c253978f65ff7d1498ce SHA-256: 4b139e6b28a95687419fac88c7cff2dddb0661453917519e8aea5aad9814b5d9
152 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. Additionally, it contains a mass external PDF link farm, with many links hosted on Shopify.com. The embedded URL in the document body also points to the malicious redirector. These factors indicate a likely attempt to lure users to malicious content or manipulate search engine results.

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=active+and+passive+voice+multiple+choice+exercises+with+answers+pdf
    • http://gizitali.sarahwyldphotography.com/uploads/1/3/1/3/131384169/tifeb_sajeva.pdf
    • http://files.communionfellowship.org/uploads/1/3/1/8/131871956/zexisud.pdf
    • http://files.losangeleswomenstheatreproject.org/uploads/1/3/1/3/131378899/kidoxowi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3293/5574/files/lovizafegu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0073/3596/files/kedefe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/79021447079.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7988/files/goterazuduvuxowifet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6510/4791/files/84029648532.pdf
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/51656356499.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/81266606245.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/43092512139.pdf
    • https://cdn.shopify.com/s/files/1/0432/8488/9758/files/63101463714.pdf
    • https://cdn.shopify.com/s/files/1/0430/8303/8874/files/wixakisolosewamumodevari.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rimudunibodosugesujusuvud.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_off0000518c.bin
0817f7f85d1281d932cce1430fb1ca0a64b0991203ec51f414cc6a0a30636759
pdf-font-stream PDF embedded font (sfnt) at offset 0x518C 5604 bytes
font_01_sfnt_off0000647f.bin
f52a1fa6a5b5396b4825f32e301d5a44fc8b51074c12a83556335f85b71276fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x647F 10248 bytes