Malicious PDF — malware analysis report

Static analysis result for SHA-256 731b8d16cfea54fc…

MALICIOUS

PDF

41.0 KB Created: 2020-08-08 05:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d4f10c5f6549867ef8d7f4d5537b1e8 SHA-1: 5649e1477417ff1c2d783b5e6ad631a4868009c0 SHA-256: 731b8d16cfea54fc73b335c5a9dbec58f220868116dcded6c675ab65812fe4d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to suspicious domains or redirectors, indicating a link farm or phishing attempt. The primary link, 'https://ttraff.com/pify?keyword=diagnostic+microbiology+free+pdf', is flagged as a malicious redirector. This suggests the document's purpose is to trick users into visiting malicious sites, likely for credential harvesting or malware distribution.

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=diagnostic+microbiology+free+pdf
    • http://zijod.myentouragemusic.com/uploads/1/3/1/4/131437919/lovumem.pdf
    • http://files.athenalenawee.org/uploads/1/3/2/6/132681479/lirelajipekeki_lagipa_tivukik_duragera.pdf
    • http://julomut.magiclessonslive.com/uploads/1/3/2/6/132683014/868390.pdf
    • http://files.daeiraconservation.com/uploads/1/3/1/6/131606953/7f1e2d7ac0ee06.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0602/5128/files/xobebuwi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7719/files/tamil_to_english_spoken_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/16423402919.pdf
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/33838280349.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9709/files/56658955231.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/96401894672.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/gomiwuguvisapubopeji.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/muwukitateno.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006102.bin
03f22f39dbd64369a4ee613549d59ca6480565b23416b7e59303cf689d38a9c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6102 5716 bytes
font_01_sfnt_off00007470.bin
9c17a33ae09c2044b99a787ad689ce7399b3c528f3c43892628ad2963ed18d9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7470 10236 bytes