Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9ef6281b354f5d…

MALICIOUS

PDF

41.1 KB Created: 2020-08-26 22:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1708a225b4df5f1f1598edf6645a864c SHA-1: 83a246e87cd3a4a1dc66643f833f32651bfdef80 SHA-256: be9ef6281b354f5d5c08dbcb31e872b93f0f79ac1257fd05f23b5771537710b8
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector (ttraff.com). The document body, though heavily obfuscated, contains text related to 'free movie autopsy of jane doe' and the malicious URL, suggesting a lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation to drive traffic to malicious sites.

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/pify?keyword=free++movie+autopsy+of+jane+doe
    • http://mewiga.kesuwon.com/uploads/1/3/2/8/132814930/1919294.pdf
    • http://files.nyegirlboutique.com/uploads/1/3/1/4/131482853/38c34.pdf
    • http://files.thesoftandwild.com/uploads/1/3/2/8/132815148/7873198.pdf
    • http://files.mentalhealthjunkie.com/uploads/1/3/1/3/131380128/bepezotetojofaxuduvu.pdf
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/btc_directory.pdf
    • https://cdn.shopify.com/s/files/1/0434/5892/0605/files/netavojumegokele.pdf
    • https://cdn.shopify.com/s/files/1/0438/1592/7965/files/15823967550.pdf
    • https://cdn.shopify.com/s/files/1/0434/7691/0242/files/gojakisug.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/can_you_netflix_shows_on_laptop.pdf
    • https://cdn.shopify.com/s/files/1/0440/2642/9605/files/connectors_list_with_bangla_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0464/7351/1064/files/35173759032.pdf
    • https://cdn.shopify.com/s/files/1/0436/1859/9075/files/carp_fishing_rigs.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/femedilarebogigesoteke.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gaxedisurerikemamezawapux.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/pokegasudumozererapa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/51716204224.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/15051658373.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005438.bin
af11db5508a6613c914278a147cc2da4abb695c883bacb4b884243458b65ff7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5438 5228 bytes
font_01_sfnt_off000065f7.bin
c728cb16c47ba5ce4abfa24a587bff1c5e927eef5245ade9e9243669819d7400		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F7 10284 bytes
font_02_sfnt_off00008921.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8921 4324 bytes

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