Malicious PDF — malware analysis report

Static analysis result for SHA-256 019b97df0c643535…

MALICIOUS

PDF

36.9 KB Created: 2020-08-04 13:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cb096c58641c45e219f83dcd48dc83f SHA-1: e85dd84de47e90fbe1ecb778a6a976957da66eb5 SHA-256: 019b97df0c643535d984d1442234f178b8f4bfdaa2d58c1d92b40a07cf27dd7b
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains the text 'Phase 2 jolly phonics worksheets' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=phase%202%20jolly%20phonics%20worksheets
    • http://files.thedinopark.com/uploads/1/3/2/7/132740415/6535022.pdf
    • http://files.monetwithacamera.com/uploads/1/3/1/3/131379205/8107137.pdf
    • http://files.fasthandyman.us/uploads/1/3/0/8/130814279/2836557.pdf
    • http://files.arcrestour.com/uploads/1/3/1/6/131606491/gurar-takonaxino-fezudo-tipigewujugora.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/lelizatujanam.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/93594949255.pdf
    • https://cdn.shopify.com/s/files/1/0429/0835/2679/files/verikox.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0964/files/mobility_scooter_repair_manuals_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/bokojarazalef.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/89524777533.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/88805396300.pdf
    • https://cdn.shopify.com/s/files/1/0433/8611/0110/files/jadewugom.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7554/files/15070367654.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/zesibolafepurox.pdf
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/99563442688.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/57802659099.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
stream_004_off0000637f.bin
197ed404c3e93b62c631e46ddf4d6198dfb664b9d69ea687003d403b6cbb7792
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x637F 10472 bytes
font_00_sfnt_off000050bb.bin
f88a8b3d4a5af6c5a596e62a27cffe2b80eebb5655bdfa3e51fd2db525bc474f
pdf-font-stream PDF embedded font (sfnt) at offset 0x50BB 5488 bytes