Malicious PDF — malware analysis report

Static analysis result for SHA-256 2546513bd808f0a9…

MALICIOUS

PDF

59.8 KB Created: 2020-08-05 18:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b3f82f138b95cf46661bcd499d8138 SHA-1: 8fbc59c299ac6470d42f1d26baea0d107ae007e3 SHA-256: 2546513bd808f0a9ea85f640fb899f40d0ce149df0a5193c6290e859cdf05417
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a guitar chords chart, which is part of a larger link farm strategy. The ML classifier strongly indicates maliciousness, and the presence of numerous SEO-optimized PDF links hosted on Shopify suggests a coordinated effort to distribute malicious content. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

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=guitar+chords+chart+for+beginners+pdf
    • http://files.synergysoundltd.com/uploads/1/3/2/6/132681602/29a8c9b.pdf
    • http://files.stabletables.net/uploads/1/3/1/4/131483138/ravanidupuweka.pdf
    • http://files.bigbucksobx.com/uploads/1/3/2/6/132681783/rimanuzijekevadibuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7282/files/garilerenalafojeso.pdf
    • https://cdn.shopify.com/s/files/1/0433/8637/2246/files/nigavabixatabin.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/ritama.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/raluzakelepoje.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/10326180903.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9797/files/kixuxamonewizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6306/files/54406002703.pdf
    • https://cdn.shopify.com/s/files/1/0428/9737/5399/files/94172757212.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/nobam.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/zusumozezexawosagemiwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/78288729574.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/52154754040.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/66016756862.pdf
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/navosijejalaredafal.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_off000094ec.bin
1c407b4356f119a91e26c0bf772975af2ca999fd8b0aa1c6e9de99db10e2a44d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94EC 5556 bytes
font_01_sfnt_off0000a7cb.bin
c0c9df051daef6d743bbe6d028eea858ad443057bbfe28ca22b99640520b9094		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7CB 10216 bytes
font_02_sfnt_off0000cb08.bin
3843e86183f501df8859981d7610fa40343104ecc6001567920a71972151aa82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 16076 bytes

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