Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf2a4401a1dde33…

MALICIOUS

PDF

52.0 KB Created: 2020-08-11 04:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5604ee26bf90d2ded74582bdcc327a1d SHA-1: 1796a3727da73370c9a40a3b105acbd20127d6b5 SHA-256: abf2a4401a1dde33ed84958abf32251c1a3d4c047bf5ab7522425c87353791e0
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is a common technique for delivering malware or phishing pages. The document body and embedded links suggest a lure related to educational materials, specifically 'elementary biology class 11 pdf'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The PDF also contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of SEO link farm tactics used to obscure malicious destinations.

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=elementary+biology+class+11+pdf
    • http://files.keysscape.com/uploads/1/3/1/4/131453136/vazoxuto.pdf
    • http://files.retirementtimeline.com/uploads/1/3/2/7/132740285/bakuzenazupoxa.pdf
    • http://rizas.samuidivesupply.com/uploads/1/3/0/9/130969723/8183268.pdf
    • http://joziwofi.myroncotton.com/uploads/1/3/1/0/131070993/3176883.pdf
    • http://files.libertycraftbrewing.com/uploads/1/3/1/1/131164210/witorumotoso.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/wevopaxi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4253/5581/files/gajanase.pdf
    • https://cdn.shopify.com/s/files/1/0430/8018/8058/files/suzuki_eiger_400_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/pedarijasidalebonigada.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/luwin.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/23126052356.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/14328563441.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/25071017434.pdf
    • https://cdn.shopify.com/s/files/1/0437/5900/9943/files/carbon_dating_examples.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/1336634235.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7969/files/how_to_draw_human_faces_step_by_step.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_off00005acc.bin
9a8204b3a49c42f700262338ca32485c1f323aba73f321a0f45a9610f750a795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACC 5724 bytes
font_01_sfnt_off00006e31.bin
a39d09223a37b348cf89458d18d8e935856af5c4a65ff07a1213a534314bdf84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E31 2340 bytes
font_02_sfnt_off000078e4.bin
09d4aeba1a31f0e00db4612a04b0f68938434ac07a1d4eff498af6fae51648da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E4 15896 bytes
font_03_sfnt_off0000aa55.bin
aa271c9f2f3e85516b55a12ca92b26b3ee0fdcce37f7f3758cce62b90f278e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA55 16480 bytes

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