Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64f4069e15fdc33…

MALICIOUS

PDF

46.8 KB Created: 2020-08-31 06:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e28faf60d7023a710ec1fc5bfac31263 SHA-1: eb2730e578c78eb8a18c854785d09a00767f0301 SHA-256: c64f4069e15fdc339daab20146b7726016002bacf1c8b4a740c69fcf2c6d2628
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in Systems 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 URLs, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The document body, though heavily corrupted, appears to contain the same URLs found in the heuristics and link farm.

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=avalia%25C3%25A7%25C3%25A3o+diagnostica+de+matematica+3+ano+ensino+fundamental
    • https://cdn.shopify.com/s/files/1/0438/0993/1426/files/derewexi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5091/8310/files/classification_of_plants_and_animals_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/4389/4934/files/44945453874.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/diablo_2_power_leveling.pdf
    • https://cdn.shopify.com/s/files/1/0428/5018/9478/files/xibivuz.pdf
    • https://static.usrfiles.com/ugd/1cfe37_0504899e05cc4c9b9e6597bceca9f108.pdf
    • https://static.usrfiles.com/ugd/b8c837_d00699e14d084271a2a4c8d3ad75c5f0.pdf
    • https://static.usrfiles.com/ugd/38eac1_ad48919470fa4c848d8758f0d93dc143.pdf
    • https://static.usrfiles.com/ugd/111c46_4b964f0392ba4c02b7048d1cd683a4bd.pdf
    • https://static.usrfiles.com/ugd/1e32c2_486e1006a0f048b2bb43597a5c85d5ad.pdf
    • https://static.usrfiles.com/ugd/1b8612_e856e02dab5a424bbe8882c293943468.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/online_advertising_research.pdf
    • https://cdn.shopify.com/s/files/1/0433/3636/8283/files/71188190312.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8151/files/jufav.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_off00007084.bin
0c039d12d5180191b00ae5964db84754c2e1ae9e8d6e98c990959b899ea27008
pdf-font-stream PDF embedded font (sfnt) at offset 0x7084 5960 bytes
font_01_sfnt_off000083e6.bin
42a5be1e09372b8c52dcad803120228f89bee6a99e507b548908b0f44156a277
pdf-font-stream PDF embedded font (sfnt) at offset 0x83E6 13284 bytes