Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe158ceee032c4e4…

MALICIOUS

PDF

46.2 KB Created: 2020-08-13 22:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8b6dfdc8f4801bb37b301b0b5adffd1 SHA-1: 40be01f42d8eb5393fab3403e43df8b9369abd0c SHA-256: fe158ceee032c4e410d1d8b89a246ef02355dda26b56350e4f2ff81d7219a63a
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, and one critical link to a known malicious redirector. The document body explicitly mentions 'Antivirus for window 7 free', indicating a lure to download potentially unwanted or malicious software. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=antivirus+for+window+7+free
    • http://files.hollykeephotography.com/uploads/1/3/1/3/131381681/jekudoxenarug.pdf
    • http://files.figmentsandglimpses.com/uploads/1/3/1/8/131856602/8c5f3335603.pdf
    • http://files.killmancustoms.com/uploads/1/3/1/4/131406558/8989460.pdf
    • http://files.miltonmurray.org/uploads/1/3/1/6/131606644/nelemilor.pdf
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/26895399413.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/sovuwob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xirapekewovefosisukepeja.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8970/files/fejide.pdf
    • https://cdn.shopify.com/s/files/1/0433/8542/1978/files/iit_foundation_maths_books_for_class_8_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/15694284936.pdf
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/derevopozo.pdf
    • https://cdn.shopify.com/s/files/1/0436/5906/7550/files/luzaxano.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/zogeka.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/75365606041.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/87041968145.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/gusif.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_off000075c3.bin
5a8444bb57fd3cf0d13dc87ad5b6d9270b2ca30c265c5001138c125df104d646
pdf-font-stream PDF embedded font (sfnt) at offset 0x75C3 4880 bytes
font_01_sfnt_off0000868b.bin
eb39a9ebd0adeff702e73d70e96813ce406c1a8bab29cd7b0e636fcc72cf9c17
pdf-font-stream PDF embedded font (sfnt) at offset 0x868B 11392 bytes