Malicious PDF — malware analysis report

Static analysis result for SHA-256 a681e322324c8710…

MALICIOUS

PDF

43.8 KB Created: 2020-08-15 07:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e65a141f0e96cfd3f09185fc66f99c88 SHA-1: fae4fbffc0cb32dc002228d1594154f94fe4a161 SHA-256: a681e322324c871071551b8011f228c04f01f05ebf1d9f0211ef9371f148aba9
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the primary malicious link pointing to `https://ttraff.ru/pify?keyword=all+comedy++3gp`. This URL is flagged as a known malicious redirector. The document body is heavily obfuscated and contains remnants of the malicious URL, suggesting it's part of a lure. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

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=all+comedy++3gp
    • http://voxar.wooddragonadvising.org/uploads/1/3/2/8/132814718/badenulukar.pdf
    • https://cdn.shopify.com/s/files/1/0438/4771/2928/files/58303234796.pdf
    • https://cdn.shopify.com/s/files/1/0439/5555/2414/files/billing_system_in_telecom.pdf
    • https://cdn.shopify.com/s/files/1/0434/4234/0007/files/99016724936.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53262414385.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8741/files/ski_doo_service_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/bubibexajo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2518/5442/files/naruto_shippuden_episode_86_english_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/xadadavevinuxex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0452/4458/0002/files/application_for_schengen_visa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6255/8874/files/volas.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/naxedajevuxegarep.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004afb.bin
f36a90fe25b6a6b4cbda56870d123c81723e16ddbfbb0ae26d7d19ccda2f6dcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AFB 4716 bytes
font_01_sfnt_off00005b0e.bin
596b103351977ea7efd0a7262ae8f8168ae10d52e50d37532125a1398f5b2c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0E 10188 bytes
font_02_sfnt_off00007e1f.bin
c64f975c7c74378765a15e192890ba001b575443647995d4109c17b56814fb1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1F 16544 bytes
font_03_sfnt_off00009461.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9461 4324 bytes

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