Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b0ad3c99fae666…

MALICIOUS

PDF

50.9 KB Created: 2020-08-23 17:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3703a2284220c7eee3349a00152f4e28 SHA-1: b4c12d6e49c2bd31a953f0e7ca0202fc6b26e7ee SHA-256: d0b0ad3c99fae66615ad449ff7ffbde71f966c2da4421fff6263a2a7f9d4a6ba
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources. One of these links, https://ttraff.cc/pify?keyword=walter+de+la+mare+biography+pdf, is known to lead to malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain the same URL, suggesting a lure to a malicious site. 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=walter+de+la+mare+biography+pdf
    • http://files.howlinwolfhounds.com/uploads/1/3/1/3/131381612/vexokosewakav.pdf
    • http://files.honorboundco.com/uploads/1/3/1/0/131069899/36517cf6.pdf
    • http://files.homelesspetslifeline.com/uploads/1/3/1/4/131437813/pawoguzu.pdf
    • https://cdn.shopify.com/s/files/1/0447/2979/4713/files/titominarufubovidukukewa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85484739365.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/fuwagetufeziripevot.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8795/files/51027576782.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/rugudunaguwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/90547548072.pdf
    • https://cdn.shopify.com/s/files/1/0431/1882/1530/files/standar_akuntansi_pemerintah.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_off00008878.bin
ccbaadfac192f9e3fe3cf2b3687bccd0e572b0c3a2251194a725190c30d898bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8878 5532 bytes
font_01_sfnt_off00009b33.bin
d0fa210fbc0b319e0dde5841d9279a4ae0d511a2d8f23d0e4cb048492c753a30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B33 10672 bytes

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