Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0fc2ea7619c4b3…

MALICIOUS

PDF

36.9 KB Created: 2020-08-10 10:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bed5b5e7bfe43f9c14cc40bd49e81b4 SHA-1: 366e5a09a6724baac6baa5ecd548635dffd3e00b SHA-256: bf0fc2ea7619c4b3b09c7b02902ce405e99fb2379e71711fd41b822e6df87c04
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links, including one to `ttraff.ru`, suggests a link farm or redirection attack designed to lead users to malicious content.

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.ru/pify?keyword=alter+ego+1+plus+cahier+d+activit%25C3%25A9s+pdf
    • http://files.sschroeder.org/uploads/1/3/1/0/131070597/vileritufane.pdf
    • http://lixoj.ebbrown.net/uploads/1/3/1/6/131637814/xamuxaxat-ragab-jobibaduwuga.pdf
    • http://files.lauracarolyn.com/uploads/1/3/1/4/131437983/kumilikiraseber-jufinoduse-gutujo.pdf
    • http://files.equusourique.com/uploads/1/3/2/6/132682892/sexukowedup.pdf
    • http://mopik.purpletigergonewild.com/uploads/1/3/2/8/132814930/868666adcc1cd.pdf
    • https://cdn.shopify.com/s/files/1/0437/3276/2785/files/kegopivotapisawavarudap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zobuwavidojanunixi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2450/files/55405396961.pdf
    • https://cdn.shopify.com/s/files/1/0437/4567/3377/files/lorex_eco_stratus.pdf
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/vigupovalamoweluvemoxixa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0166/6969/files/becker_muscular_dystrophy.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/rinexowaroregitidedojan.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/24167835207.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9576/files/nezabizinaka.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/vogewafa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/kinubebutavutasedudigam.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6440/files/83032353771.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_off00004e59.bin
b0468fb5b6e753affdcbc62d54d951cc87ed870c2f785d2a0be8f3f9152b47a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E59 5660 bytes
font_01_sfnt_off00006166.bin
1ade09fbffaf6e3031d3e38d4597fba0141a3d8929b877caf147a0b7cfe58eda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6166 10944 bytes

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