Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4cffd90409c1ca…

MALICIOUS

PDF

41.7 KB Created: 2020-08-31 06:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ea551d8cf6ba76056980b74f3a2f24c SHA-1: 45b0b5f76db29a5b6d8ab05d550e4f4569a356fa SHA-256: 1c4cffd90409c1ca08020842f966afb6a4b77886499cdefc381956def18bb20f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains this URL and a large number of other URLs, many hosted on Shopify, suggesting a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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=ark+industrie+schmelzofen
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/49544720810.pdf
    • https://cdn.shopify.com/s/files/1/0434/7871/2472/files/sivilumewolixizus.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/80819665152.pdf
    • https://cdn.shopify.com/s/files/1/0434/7199/5030/files/atom_bomb_picture_ing.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/pasazaninepoguve.pdf
    • https://static.usrfiles.com/ugd/3aca14_ddba0e6791d440afa506d199ad74b41e.pdf
    • https://static.usrfiles.com/ugd/cc03df_334fde10133949e0b6e7d60007c4286a.pdf
    • https://static.usrfiles.com/ugd/b80405_7f7fd249ff4c4f35ac340f9d5d4217b8.pdf
    • https://static.usrfiles.com/ugd/8acad3_3b94efb6cca547aaae7266d6e39c3683.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2046/files/caida_del_muro_de_berlin_causas_y_consecuencias.pdf
    • https://cdn.shopify.com/s/files/1/0434/8500/3926/files/gonivikuligikexina.pdf
    • https://static.usrfiles.com/ugd/eed56f_eab0bc73039b472eb79d64d9534b639e.pdf
    • https://static.usrfiles.com/ugd/aef5b7_63aa1a435af649349991308d208f7cb6.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_off0000625a.bin
0818890841c060ea85fed6361ebb29ed15b9dac72316cb01614810d892d99ac6
pdf-font-stream PDF embedded font (sfnt) at offset 0x625A 5156 bytes
font_01_sfnt_off000073ba.bin
db2cccc81e9295aa925030fe8629305a385f0b25a7a87ae7f41d9d169f6c31fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x73BA 11460 bytes