Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4b9e1b9d972ed6…

MALICIOUS

PDF

44.5 KB Created: 2020-08-31 04:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f627ae4676fd1d5607682355dbc4c4e8 SHA-1: 4ebd2740ef32cd793faaeecb338829006da6f7ec SHA-256: dd4b9e1b9d972ed6adb41d8e3fe6d2de130e5648f9e233b07f6d89606db3e768
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, with the primary one being to a Shopify domain. The ML classifier strongly flagged this PDF as malicious. The presence of these elements suggests the document's primary purpose is to lure users to malicious infrastructure via the embedded redirector URL.

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=shimano+rs10+weight+limit
    • https://cdn.shopify.com/s/files/1/0431/0240/4769/files/94159396509.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/mega_punch_or_mega_kick.pdf
    • https://cdn.shopify.com/s/files/1/0432/8285/8144/files/39073493798.pdf
    • https://cdn.shopify.com/s/files/1/0440/4304/2966/files/37653966782.pdf
    • https://cdn.shopify.com/s/files/1/0435/4038/1855/files/resistance_loop_band_exercise_guide.pdf
    • https://static.usrfiles.com/ugd/36f25b_0f87db3996dc4177b1b6979b342779f6.pdf
    • https://static.usrfiles.com/ugd/d5415a_f317c0dcb4bb43f99f453b3c6dd6c1ad.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_55e06cb25ed544ab8d0e8fd9a0634780.pdf
    • https://static.usrfiles.com/ugd/4bb894_bfe28638c8cd437d89a8f9afb436ab4b.pdf
    • https://static.usrfiles.com/ugd/87a178_022fa923706744a1852112b7cc2046bf.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/22672008533.pdf
    • https://cdn.shopify.com/s/files/1/0435/5817/4883/files/4423292491.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/90244858787.pdf
    • https://cdn.shopify.com/s/files/1/0431/2124/6370/files/18674615289.pdf
    • https://cdn.shopify.com/s/files/1/0440/9117/9160/files/java_64_bit_windows_8._1_minecraft.pdf
    • https://static.usrfiles.com/ugd/daca0d_3b80bf8addb44a169a9f8748ad3fade2.pdf
    • https://static.usrfiles.com/ugd/b8c837_8afbc1d284604938b04773cf9b93acff.pdf
    • https://static.usrfiles.com/ugd/865d50_1763d39cd8ff4d68bb7ef922b48bec56.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_off00006dbc.bin
9d1ded776116fdac7888c09b292b7638b2500ed72a816b75c8cee4a307385c80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBC 5488 bytes
font_01_sfnt_off00008047.bin
f788cdb949a50553f8bf75b6ef1299da9b03ef9dd917d8bcf4cb4841580137ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8047 10684 bytes

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