Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3a448190a0c0b8…

MALICIOUS

PDF

50.9 KB Created: 2020-08-03 22:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6f40e77b0ccc24ed998ba5d61486313 SHA-1: c32d02401f9d1b06ee370001b64e1ea4928d8b12 SHA-256: 1b3a448190a0c0b8c56c1851ecfd810260d65bad1a475118114601688e9e75a5
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, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious infrastructure. The primary attack pattern involves luring users to click on these links, which are presented as academic resources but likely lead to malicious 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.ru/pify?keyword=maslow+s+hierarchy+of+needs+pdf
    • http://files.egnicksdtp.com/uploads/1/3/0/9/130969735/pusaruwevagubor.pdf
    • http://files.smbdigitalista.events/uploads/1/3/0/7/130775342/zonosanutat_xonodesogako_regigukex.pdf
    • http://files.sessumselementarypta.org/uploads/1/3/0/9/130969527/0e6c3b9070e9e29.pdf
    • http://files.sandysfashionsformen.com/uploads/1/3/0/8/130814056/jazizafoboroz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3021/6855/files/kogelax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685913575.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/xuzazezepudafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/13341953477.pdf
    • https://cdn.shopify.com/s/files/1/0433/6563/0102/files/lewugokugepusenu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/fefifefotat.pdf
    • https://cdn.shopify.com/s/files/1/0428/8646/3647/files/72876956978.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4103/files/favudupupojikom.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/ruberelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/8843926686.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/suziwuxusuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6261/files/divezidilo.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_off000071df.bin
de643c6a292699e8b796945116caefc7e304b025ec68e1acf8841aabd38862d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DF 5152 bytes
font_01_sfnt_off00008363.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8363 1800 bytes
font_02_sfnt_off00008bf1.bin
42eb212a81c1b6f6bb7a45b2d73e4108bfb4479739ea4449aa52f18445f6d498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF1 10488 bytes
font_03_sfnt_off0000afbd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBD 4324 bytes

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