Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e765cd550161fe…

MALICIOUS

PDF

44.3 KB Created: 2020-08-13 21:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38be2c835ad38a80b92827e995c11434 SHA-1: bd4b91f162264fb0da1b44871038f88bd8b8aee0 SHA-256: b7e765cd550161fe62535a98ab5a4cf0b5249d0c5e26c55cc48c392082649b53
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL for the redirector and several other PDF links, suggesting a link farm or redirection attempt. No scripts were extracted from this sample.

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/pify?keyword=formal+languages+and+automata+theory+definition
    • http://luvoge.simplysugarplumbakery.com/uploads/1/3/0/8/130814328/5483468.pdf
    • http://files.topskiresorts.eu/uploads/1/3/1/3/131398547/veberavok.pdf
    • http://texalela.work2gether.space/uploads/1/3/1/4/131437119/be32551a7f345.pdf
    • https://cdn.shopify.com/s/files/1/0432/8269/4312/files/complete_callanetics.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9376/files/tekuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2030/4034/files/braderie_lille_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/95957410917.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6561/files/16358361346.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/bejukevalozimewedu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/5956096058.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rokagarunawawutasa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/rosetta_stone_bit_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0434/7658/2560/files/rozedirur.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c3a.bin
9140e54458cc8dc41807227b12ee15d37a3290d40d65f27e0fb7896b32a334de
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C3A 5260 bytes
font_01_sfnt_off00005ded.bin
18be6573418b361d7ab49d2a9226874f33685e5ddc20d1296e35b7287c58d39c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DED 10048 bytes
font_02_sfnt_off00008047.bin
d0060e0062ef2111779b986d89630df19a0ed8d9c38ac2f2ee149639c3f2e4f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8047 16236 bytes
font_03_sfnt_off000095b2.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x95B2 4324 bytes