Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08881c5da8efc31…

MALICIOUS

PDF

42.8 KB Created: 2020-08-11 23:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3538941c63701929d10432d05f7a305 SHA-1: 293c42969f250b9fe8d88e5860dad65af0e2f578 SHA-256: c08881c5da8efc31855c1c0cdfc3c3ef5ece1f809794c0d1d5498b4b1cd0a767
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.ru/pify?keyword=can+t+help+falling+in+love+piano+chords+pdf`. This URL is presented within a document body that appears to be a lure for piano chord information. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to `cdn.shopify.com` which is likely used to host or proxy the malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=can+t+help+falling+in+love+piano+chords+pdf
    • http://kosuzi.notesmove.com/uploads/1/3/1/8/131857631/rolotimemaminod.pdf
    • http://zamonepiw.johnknoxhouston.org/uploads/1/3/1/1/131163599/4541725.pdf
    • http://wuzelebi.swanseaspeechandlanguage.co.uk/uploads/1/3/1/3/131379578/2971268.pdf
    • https://cdn.shopify.com/s/files/1/0434/2933/1100/files/66572069841.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5542/files/can_i_tink_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4698/files/2785666783.pdf
    • https://cdn.shopify.com/s/files/1/0436/5837/9417/files/xivubupe.pdf
    • https://cdn.shopify.com/s/files/1/0427/6997/3415/files/wenetoduputexenadokizexi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/c_s_lewis_space_trilogy.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/xubabebadoxabavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/jowipenesur.pdf
    • https://cdn.shopify.com/s/files/1/0431/0709/0581/files/tibiroxirata.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6099/files/makalah_budaya_bali.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8138/files/noluzuti.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/wevujiwopive.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_off00004ed8.bin
23a2aeb84b64351baab03c7304a42b1697296a35d08e38d5f6f06def6f3987ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED8 5288 bytes
font_01_sfnt_off000060d7.bin
4fe77f325468297b27fc956a84e3735805536eeeb416236a3833f0e6e7f985bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x60D7 14440 bytes
font_02_sfnt_off00008e51.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E51 4324 bytes