Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8423d0fe78a429…

MALICIOUS

PDF

39.4 KB Created: 2020-08-22 03:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e12a0a647dc6757e3dd396c4116346bc SHA-1: 3ac6b37cd115818558415f3b158dc66f7ab51b85 SHA-256: be8423d0fe78a42977f50570f8dc3ad45bb963744e81df853d192051ce6ec18c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This link is presented within the document body, likely as a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify. The ML classifier strongly indicates maliciousness. The primary attack pattern involves redirecting the user to a malicious site via the embedded link.

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=bde+full+form+in+business
    • http://files.billshobbiesmodelshop.com/uploads/1/3/1/3/131384721/6645541.pdf
    • http://pofadiva.jwhitneyart.com/uploads/1/3/0/7/130775565/2726583.pdf
    • http://bowum.desertblossompreschool.com/uploads/1/3/0/9/130969754/sodukiwuzeminiwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1873/files/french_english_dictionary_pc.pdf
    • https://cdn.shopify.com/s/files/1/0435/9507/1651/files/nulofefuv.pdf
    • https://cdn.shopify.com/s/files/1/0440/9327/6312/files/passover_haggadah_hebrew_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/wobemabekapobepub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gefoviliruvowej.pdf
    • https://cdn.shopify.com/s/files/1/0464/2819/2920/files/29029497589.pdf
    • https://cdn.shopify.com/s/files/1/0432/0467/3697/files/70484106459.pdf
    • https://cdn.shopify.com/s/files/1/0437/7450/9213/files/75806905679.pdf
    • https://cdn.shopify.com/s/files/1/0437/2666/7925/files/tegifu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4789/2630/files/surf_report_doheny_beach_california.pdf
    • https://cdn.shopify.com/s/files/1/0436/0405/0084/files/52393146002.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_off00005db8.bin
42582ddb2ff9c37bd7048f47eb3ee2472ca995814bc41a2df853528e1cc70944
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB8 5032 bytes
font_01_sfnt_off00006eb8.bin
04f4b3e97b770c7cd63b77d785875e3b33da1864f3343437d9a9f33341ac409c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB8 10092 bytes