Malicious PDF — malware analysis report

Static analysis result for SHA-256 7321796b84386e59…

MALICIOUS

PDF

44.9 KB Created: 2020-08-06 02:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 187d9bafe86e22be9b52d6ae85726630 SHA-1: b9eb43ef0504fe845370d1b6f916517e5c58dcb5 SHA-256: 7321796b84386e592d60b08a72be99fa99adb6d76112280c6149b84c29e2ea07
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external PDF links, many of which are hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which likely serves as the entry point for the malicious chain.

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.com/pify?keyword=ceroplastes+floridensis+pdf
    • http://files.holyspiritchurchde.org/uploads/1/3/1/3/131380756/jugozasedevel.pdf
    • http://files.kyushoacademy.com/uploads/1/3/0/7/130776200/6018301.pdf
    • http://files.ofsilvermills.com/uploads/1/3/1/4/131482915/nusoramalawujezefok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1044/0859/files/dd_form_626.pdf
    • https://cdn.shopify.com/s/files/1/0431/3759/7596/files/89494207483.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/68797052096.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/28500739163.pdf
    • https://cdn.shopify.com/s/files/1/0430/8775/7461/files/90338920657.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/47311545592.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6161/files/cracking_the_pm_interview_github.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/5113687722.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/pewajijimodosonurek.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/fusuwilorejesaxunofebox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/395667921.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/examples_of_python_programs.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007373.bin
c5c5418dbb4b9916aae8cf8627c1493bf3ca4eb8b5e4d187958d1d9b4db6a6f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7373 4940 bytes
font_01_sfnt_off00008445.bin
e14ce95281aa39dc5074bf75afb46d00b6e73c25b91e826c3418eb8c064fe927
pdf-font-stream PDF embedded font (sfnt) at offset 0x8445 9944 bytes