Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ad2f939f1e899a…

MALICIOUS

PDF

55.8 KB Created: 2020-07-31 01:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bfad11e467cc29cedd028ad18a5696f SHA-1: b8322ac84dfb7e7d899287518520d0e86f2d97d5 SHA-256: b9ad2f939f1e899a3afb5957bbf53ce12e8fcd4c7fb88d22a2e16f743013c66a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with the primary malicious redirector pointing to 'ttraff.ru'. This infrastructure is used to distribute further malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'Gujarat university b. com books pdf', suggesting a lure to attract users searching for academic materials.

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=gujarat+university+b.+com+books+pdf
    • http://files.tennisunderthestars.net/uploads/1/3/1/4/131406412/b9800cb.pdf
    • http://files.seashells-nursery.org/uploads/1/3/0/7/130739238/9933c619.pdf
    • http://files.lanesjewellers.com/uploads/1/3/0/7/130775845/vunudilelujedubum.pdf
    • http://files.thebullinnwestmalling.com/uploads/1/3/2/6/132695519/de1d6.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2557/files/romaribitibafelojasajim.pdf
    • https://cdn.shopify.com/s/files/1/0437/4229/8264/files/59621459418.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/37599795807.pdf
    • https://cdn.shopify.com/s/files/1/0436/3619/5488/files/foluxaweposolagokifiki.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/tidafug.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/mezilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6066/files/tobozarajutomugijamu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/39915101799.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/84723367987.pdf
    • https://cdn.shopify.com/s/files/1/0436/0100/2664/files/9124831837.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/
    • https://cdn.shopify.com/s/files/1/0436/3619/5488/file

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bdd.bin
0d0b94705c19f79a7eb0470fcb4df7f463b01da599d011457c162e8c6c4d8b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDD 5656 bytes
font_01_sfnt_off00007f15.bin
7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F15 2320 bytes
font_02_sfnt_off00008965.bin
1e94a481ad49996349bfbc13555493fbb0d8754cb8041d86c56818d435073989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8965 10212 bytes
font_03_sfnt_off0000ac8a.bin
4362e686776cae9b5e877a8e5de4a1ff5ae9966626bcf1046762b8e3a01bbea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8A 16224 bytes
font_04_sfnt_off0000c213.bin
bf79e96a7df7be6c2d30d777fe7f78d39eaeaf33e916b70b12e0febc5057387e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC213 3948 bytes

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