Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ab9349542c360d…

MALICIOUS

PDF

56.4 KB Created: 2020-08-21 21:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1501bc8e907af5fc0823dea5845c82da SHA-1: ebe71fda335e072b6efd8f1f8ad57813714a7e3d SHA-256: b7ab9349542c360d63d3c6a7b1915cb8b3535266a2dcd1cc254ba3269c79b0c6
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.cc/pify?keyword=early+guided+reading+lesson+plan+template, indicating it leads to malicious infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for educational materials, aligning with the redirector's keyword. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=early+guided+reading+lesson+plan+template
    • http://files.midwesttoken3d.com/uploads/1/3/0/8/130814439/bimusidop.pdf
    • http://files.windsorchamberchorale.com/uploads/1/3/1/0/131071063/mopozon_rowowe_lebore.pdf
    • http://kibul.rachelsweetcreations.com/uploads/1/3/0/7/130739664/jixuso-mepexiwinow.pdf
    • http://ladena.oslcaurora.org/uploads/1/3/1/8/131856158/4151b9a0b7c2b.pdf
    • http://fimobe.camden-airport.com/uploads/1/3/1/1/131164250/04e7911d4.pdf
    • https://cdn.shopify.com/s/files/1/0433/6133/7494/files/65000279206.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/tusunuto.pdf
    • https://cdn.shopify.com/s/files/1/0435/8553/6159/files/futanofev.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/91868526085.pdf
    • https://cdn.shopify.com/s/files/1/0437/7241/2055/files/cambridge_checkpoint_english_workbook_3_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/catheter_related_urinary_tract_infection.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/worunadanipujatitebex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/dupegajafel.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_off00009e66.bin
0e90a76e1b7768e745c753124b098865ec3b6170b1b92172b2818d3bf84d8b75
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E66 5336 bytes
font_01_sfnt_off0000b084.bin
a5a54e4c2de41eddcc8ef167c10ae4805dd441168b075ae6aaff61355df78489
pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 10536 bytes