Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5978fbb45515ae6…

MALICIOUS

PDF

38.7 KB Created: 2020-08-20 02:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bda0a313a5dbd5c6b33bc290cc87a387 SHA-1: 531cd4861870611435c598c475ba45577ab665b0 SHA-256: b5978fbb45515ae6427844ea1b9e41618a1ea9109a22628f80d717b5d9be0d29
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This suggests a lure to download a file, likely malicious, by disguising it as a legitimate PDF. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs and heuristic firings indicate a redirection attack.

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.cc/pify?keyword=mathematical+statistics+bickel+pdf
    • http://pewaxug.relaxingcottages.com/uploads/1/3/1/6/131607544/d3651a1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuvuwagel.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/granny_horror_mod_apk_invisible.pdf
    • https://cdn.shopify.com/s/files/1/0435/2576/7320/files/59092179664.pdf
    • https://cdn.shopify.com/s/files/1/0431/7128/3098/files/85415903873.pdf
    • https://cdn.shopify.com/s/files/1/0433/9286/0327/files/latin_to_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0432/4530/6011/files/gujorilajugakisab.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7203/files/86765032019.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3082/files/73297570120.pdf
    • https://cdn.shopify.com/s/files/1/0431/5109/8007/files/house_of_gold_uke_chords.pdf
    • http://vig.prenhall.com/catalog/academic/product/0,1
    • 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_off000058ef.bin
9437d481b41521447ba31669f965c931cbcb9ec4295e996cd58926b6756cabde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58EF 5508 bytes
font_01_sfnt_off00006b8d.bin
2c6544337d9cb35a2dad7f33fd48d22f4697eb9022e2d6d916ec38e1b2b43ba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8D 10292 bytes

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