Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af26a582c64b5fa…

MALICIOUS

PDF

53.2 KB Created: 2020-08-11 07:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6faff8cf9dcac1e8e57972f047ec6dd SHA-1: c3157a146ea4591f31cc260f02ff9dc8c9a084da SHA-256: 2af26a582c64b5fa09ab31740e62022b5948753639945ecc81502bd8e3e943e9
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'cdn.shopify.com'. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same redirector URL and a seemingly benign Shopify URL, suggesting a lure to a malicious site.

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/pify?keyword=loneliness+of+the+long+distance+runner+novel+pdf
    • http://files.acuqest.com/uploads/1/3/1/6/131606672/49a94c339163ae3.pdf
    • http://fimepas.grmfinalportfolio.com/uploads/1/3/2/6/132695535/wajixugujoxaxanagog.pdf
    • http://files.raymondbordogna.com/uploads/1/3/1/6/131637484/d44e585.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/modern_british_and_american_english_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/types_of_nutritional_anemia.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/36971423372.pdf
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/domestic_violence_act_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0429/8522/6393/files/varez.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/lazexozadusiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/81085169242.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/lupigeguxegupomad.pdf
    • https://cdn.shopify.com/s/files/1/0441/2017/8840/files/49406969559.pdf
    • https://cdn.shopify.com/s/files/1/0435/0348/5092/files/clicker_heros_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/88785387947.pdf
    • https://cdn.shopify.com/s/files/1/0433/7827/8563/files/83058840526.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/57279622048.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_off0000911c.bin
e41337e7a78a1347aafc4ff810275b292a97979c183d2ebcc4310432ef63c872
pdf-font-stream PDF embedded font (sfnt) at offset 0x911C 5416 bytes
font_01_sfnt_off0000a38d.bin
0098740780b9a2db0177b9f9d73446456438e5beecf0572259772d439bad0f7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA38D 10472 bytes