Malicious PDF — malware analysis report

Static analysis result for SHA-256 b200f1962c164488…

MALICIOUS

PDF

37.5 KB Created: 2020-08-14 19:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2efc9a8e528691621ded28d0463a8152 SHA-1: dd4ba29f9a58a6837b620b2960b638c5f392bda8 SHA-256: b200f1962c16448803121e7e8fc2453af12350cb50dac988b99f3bd27d9b53f9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm with 22 external PDF links, including one to a known malicious redirector at `ttraff.cc`. The document body, though heavily obfuscated, contains the text "Esma guidelines target market" and the malicious URL, suggesting a lure to a phishing or scam page. The ML classifier strongly indicated maliciousness, and the presence of numerous links to external PDFs points to a content-aggregation or link-distribution scheme.

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=esma+guidelines+target+market
    • http://files.tinkscience.com/uploads/1/3/2/8/132815123/pigonemezotos.pdf
    • https://cdn.shopify.com/s/files/1/0435/5512/7459/files/34469643323.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/nerujizukivexuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/45030631346.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8574/files/49639993928.pdf
    • https://cdn.shopify.com/s/files/1/0431/2789/8268/files/50570452924.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/folajas.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/denofenabokipapodemuviz.pdf
    • https://cdn.shopify.com/s/files/1/0440/8632/9509/files/probability_tough_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rojifibopi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/so_high_john_legend.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_off00005739.bin
afe17ebf644423f000d489ebb3fbbbc37294df1acca4ee57de71b6ec8765e0d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5739 5168 bytes
font_01_sfnt_off000068a9.bin
00265a9bff0393733706ae26a2886af1c727ba638af6ea01853fd12509ffd5fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A9 9700 bytes

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