Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca08a4481c1322a8…

MALICIOUS

PDF

55.2 KB Created: 2020-08-02 12:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1794ffb06cd334a90c82ae7dd9a8783 SHA-1: 1fc4d3fb8bacc86d971c435e9a3c4f3d920441fd SHA-256: ca08a4481c1322a86115cd36e2cb51dc0fc1d01b0e7084fd9321f090831a307d
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URLs, particularly the one pointing to 'ttraff.com', are indicative of a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

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=dns+keeps+dropping
    • http://files.muppetspickering.com/uploads/1/3/2/7/132740873/1207270.pdf
    • http://files.markweisner.com/uploads/1/3/2/7/132740892/8423843.pdf
    • http://files.lneconstruction.com/uploads/1/3/2/6/132681368/008b7e8f69cf.pdf
    • http://files.elitelifecoaching.net/uploads/1/3/0/8/130814055/teseloti_virogetofosawep.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/jugigekigoramodurudoluru.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3667/files/74856591434.pdf
    • https://cdn.shopify.com/s/files/1/0435/3916/9429/files/17600658003.pdf
    • https://cdn.shopify.com/s/files/1/0431/8363/6644/files/17535688635.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2941/files/28166226777.pdf
    • https://cdn.shopify.com/s/files/1/0428/4170/2567/files/lovetixavatunotus.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/senedalitorejaneler.pdf
    • https://cdn.shopify.com/s/files/1/0433/0248/6180/files/71100535975.pdf
    • https://cdn.shopify.com/s/files/1/0434/9886/4804/files/24751547731.pdf
    • https://cdn.shopify.com/s/files/1/0432/7401/0782/files/zafemedukat.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/52853405081.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/samomosaxule.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008514.bin
2c50b12e832e9f13fb7fd161b965a369e47efd7a6ff4f88b03da2542f1127131
pdf-font-stream PDF embedded font (sfnt) at offset 0x8514 4948 bytes
font_01_sfnt_off00009603.bin
f5796401350fe37afa4ad1289f57c6bfae5599f813c96ca3a9cc9119bd946597
pdf-font-stream PDF embedded font (sfnt) at offset 0x9603 10864 bytes
font_02_sfnt_off0000bb4a.bin
5d72d630640305d452d914085fd6c65e0d8125198bed8028c282d44fd0327be8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4A 16068 bytes