Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8a5736bd624542…

MALICIOUS

PDF

41.0 KB Created: 2020-08-31 05:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e745d85439e71fc9896745f19c2b750f SHA-1: 80ccb33bf3ede95539a99c530f482833c5175a43 SHA-256: 3e8a5736bd62454263a3df8b6b85ff80f2312cbf1068578b125ab5f58e5941dc
154 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as a movie download lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, pointing to ttraff.com. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient to indicate a phishing or social engineering attack.

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/wix?keyword=download+trainwreck+movie
    • https://static.usrfiles.com/ugd/7603ae_2534741643ba408c87d761a42aaef34f.pdf
    • https://static.usrfiles.com/ugd/b8c837_58fdfc4a8f1b44278fbdad7c90667232.pdf
    • https://static.usrfiles.com/ugd/4b7290_bbecc1307bd9426281901940ed06dd25.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7185/files/96204465529.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2891/files/33174204686.pdf
    • https://cdn.shopify.com/s/files/1/0430/8992/0154/files/how_to_get_linkedin_url.pdf
    • https://cdn.shopify.com/s/files/1/0431/7023/4527/files/83408790050.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5878/files/febebovabex.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/39007814457.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/didelosejir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9282/0643/files/pk5001z_modem_lights.pdf
    • https://cdn.shopify.com/s/files/1/0460/1869/1239/files/xajeregotijelaxiwitifewe.pdf
    • https://cdn.shopify.com/s/files/1/0436/3550/7358/files/kujinuravo.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_off00006424.bin
a52a10ba7826b5dc307b2d85abb39f86e5419723f7d2320c61ca5f7dd5783f27
pdf-font-stream PDF embedded font (sfnt) at offset 0x6424 5120 bytes
font_01_sfnt_off00007592.bin
b8cc9ffe34ec4bdfe3b647d40fdfd6ff63a0d3eccacb3a6429294d81af41b129
pdf-font-stream PDF embedded font (sfnt) at offset 0x7592 9952 bytes