Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccf337e0b31c67c…

MALICIOUS

PDF

69.1 KB Created: 2020-07-30 16:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d791e2e22e34d8acc81744383673fb40 SHA-1: 3ada30a55eddd240078eda97fdeae4addd54804e SHA-256: fccf337e0b31c67cb6a00c2266fd051a727021461c707c5402a49f04538cfd0d
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Le califat abbasside pdf' and the authoring application 'wkhtmltopdf', suggesting a lure document. The presence of numerous links, including one to a malicious redirector, indicates an attempt to drive traffic to potentially harmful 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=le+califat+abbasside+pdf
    • http://files.castlewoodclays.com/uploads/1/3/0/8/130873907/b18a71fa7bc6.pdf
    • http://files.stuffweallwant.com/uploads/1/3/0/7/130740624/kajewaf.pdf
    • http://files.afinerlook.com/uploads/1/3/0/7/130738870/675953.pdf
    • http://files.castlewoodclays.com/uploads/1/3/0/8/130873907/b18a71fa7bc6.p
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/vudifilosobezimoxudedisax.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9597/files/dodozapejik.pdf
    • https://cdn.shopify.com/s/files/1/0433/9725/1235/files/kivakunufogo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/divakase.pdf
    • https://cdn.shopify.com/s/files/1/0432/2492/4319/files/revox.pdf
    • https://cdn.shopify.com/s/files/1/0432/7738/5892/files/19754181757.pdf
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/78208293425.pdf
    • https://cdn.shopify.com/s/files/1/0437/8719/0434/files/xakad.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/subaferudezazumo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6842/2309/files/13974657852.pdf
    • https://cdn.shopify.com/s/files/1/0435/5388/2280/files/mevitotuju.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/legizalisebezekunu.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_off0000b1c5.bin
c1806338edd7d8579c7d83ab942d62e81917185d0148962a447760dc1703d494		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 4708 bytes
font_01_sfnt_off0000c1c4.bin
7a97742431fdefea146fb7efd3094eee657e9d81a7d7f90a162096a4d39d09a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C4 16600 bytes
font_02_sfnt_off0000f1c9.bin
6049f7be1eb58524b2bfe5e0ab34f4300347f26dbb23ab6ad605e3b0d5647553		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 16084 bytes

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