Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed04549139cc056…

MALICIOUS

PDF

41.9 KB Created: 2020-09-01 11:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f688e2b14cbcb8588eb2affcb0c4773e SHA-1: 1239816cbb20421fe5bd65776f171e3a70b1a82b SHA-256: aed04549139cc05630d021d4ca4b30a7280d663dca68e99f64fd8a48fc687bfe
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that directs users to a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'motivation letter for bursary application' and the malicious URL itself. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a phishing or scam attempt.

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.me/wix?keyword=motivation+letter+for+bursary+application+pdf
    • https://cdn.shopify.com/s/files/1/0431/3789/2509/files/51517642635.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/malapafuzeroku.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/24912418405.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/tosegejew.pdf
    • https://cdn.shopify.com/s/files/1/0437/6117/2631/files/9812978129.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4396/files/11794048211.pdf
    • https://cdn.shopify.com/s/files/1/0428/8443/2031/files/97849020958.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/pavetosulikolewubokakoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7740/2778/files/36741130991.pdf
    • https://static.usrfiles.com/ugd/a31856_235dfeddd58f405791bce48eff68a3d8.pdf
    • https://static.usrfiles.com/ugd/2b3f46_6d231b48576a4c919119cfffe815b7d1.pdf
    • https://static.usrfiles.com/ugd/270e53_9571a420f1d24a9aaaa9c122c09efe45.pdf
    • https://static.usrfiles.com/ugd/b8c837_311d9ff710d54d5ea14d805a016b4f54.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ce5c42005af4c70bb00e2326beefddc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ac.bin
a8f89745b6d16d1e21fe9b0d3459e63ce10cc5bf498179245b945b6b9ebc9026
pdf-font-stream PDF embedded font (sfnt) at offset 0x66AC 5456 bytes
font_01_sfnt_off0000795a.bin
f307b921b406f85aa85d93c73d23903575d75ac7ff39865e04b0b403d6600042
pdf-font-stream PDF embedded font (sfnt) at offset 0x795A 9676 bytes