Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e66a7dc709dbb5…

MALICIOUS

PDF

45.9 KB Created: 2020-09-01 06:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2d771cd7f549bb51edc075f18c6d00b SHA-1: d99612c3b9c8d9d03c06c7502357cd8e1b09e5e9 SHA-256: 83e66a7dc709dbb558d5e96f4a26c2081d7a66e6c868ef33691f032086e091d2
152 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.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which are to Shopify domains. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to the malicious redirector via a seemingly relevant 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.com/wix?keyword=osteoporosis+canada+guidelines+long+term+care
    • https://cdn.shopify.com/s/files/1/0438/5066/2053/files/blunders_and_brilliancies.pdf
    • https://cdn.shopify.com/s/files/1/0428/8829/8662/files/53113108355.pdf
    • https://cdn.shopify.com/s/files/1/0430/8031/9130/files/logic_gates.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/lady_midnight._cazadores_de_sombras_renacimiento._libro_1.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1688/files/beruramala.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20597849085.pdf
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/free_foxit_reader_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/neural_tube_defect_pathophysiology.pdf
    • https://cdn.shopify.com/s/files/1/0431/8714/2819/files/19707779345.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6566/files/34349900152.pdf
    • https://cdn.shopify.com/s/files/1/0438/7323/9195/files/xeposadaniper.pdf
    • https://cdn.shopify.com/s/files/1/0438/1619/0112/files/31125968650.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/madezege.pdf
    • https://cdn.shopify.com/s/files/1/0436/1738/6659/files/53393386885.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_off00007426.bin
34a2a53890c084578234da9df33005bf78e67196b9caf0bc1ef438872738ad5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7426 5420 bytes
font_01_sfnt_off0000867e.bin
a047cd624eefc2bce9aa6e5dcaafd8c68fbb0b8b72ca7f4ea2064b0ea05d74df
pdf-font-stream PDF embedded font (sfnt) at offset 0x867E 10392 bytes