Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6321613b4ff8786…

MALICIOUS

PDF

57.1 KB Created: 2020-08-31 09:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec1225a03836d6d826a0020c04675ff SHA-1: 8d8c26255c8f91ba2e030007c963ed08fba56e34 SHA-256: a6321613b4ff8786b887723cccf924bf98b1b2d38c3abf90fb1148357cc25105
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a restaurant welcome manual. It also hosts a large number of other PDFs on Shopify, likely for SEO manipulation to improve the ranking of the malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the observed malicious link behavior.

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.ru/wix?keyword=manual+de+bienvenida+de+un+restaurante
    • https://cdn.shopify.com/s/files/1/0447/9349/5709/files/22327800758.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7957/files/nirewofefofipusifu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1026/7035/files/shakespeare_sonnet_116.pdf
    • https://cdn.shopify.com/s/files/1/0433/8391/4654/files/6547250488.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/26914921601.pdf
    • https://static.usrfiles.com/ugd/fd3290_6620adf04b714efc8381cb09318332da.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_dd658731f58848cd887186e53dafc4d1.pdf
    • https://static.usrfiles.com/ugd/122077_5d60dd010bc640cdb2258b8122d44dde.pdf
    • https://static.usrfiles.com/ugd/c8a981_a4dc33d379de4a73940a3f2f09113b5c.pdf
    • https://cdn.shopify.com/s/files/1/0438/2097/4242/files/ffxiv_leatherworking_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/logepumizugi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4294/6724/files/zenixapekurinasokijufubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0020/9309/files/piwizevo.pdf
    • https://cdn.shopify.com/s/files/1/0457/3223/3382/files/75288429219.pdf
    • https://cdn.shopify.com/s/files/1/0430/7861/5189/files/40731388664.pdf
    • https://cdn.shopify.com/s/files/1/0435/0138/7936/files/84339157313.pdf
    • https://cdn.shopify.com/s/files/1/0430/5649/6791/files/zosafozemojima.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_off0000913b.bin
725fb25baf0ecef6f772d80baa11885d8fc98b43876b6fdd8843cc166f76a6af
pdf-font-stream PDF embedded font (sfnt) at offset 0x913B 5024 bytes
font_01_sfnt_off0000a25b.bin
e38495227931dc4c3f7667cfb260d7f6e29a47637612081008da243c8983b4d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xA25B 17612 bytes