Malicious PDF — malware analysis report

Static analysis result for SHA-256 198533263b74127c…

MALICIOUS

PDF

44.2 KB Created: 2020-09-08 06:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 723f160ef26718c6123104d081c20c10 SHA-1: 9e4b313982747930cbe1d794a0b22e877938909f SHA-256: 198533263b74127cb42f80b3c2b99011e7e3b476be8ca46f11292bee690d982c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains text related to an 'aging face app free' and a URL that aligns with the malicious redirector heuristic. The presence of a large number of external PDF links, many of which are benign, suggests a link farm tactic to obscure the malicious intent.

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.link/wix?keyword=aging+face+app+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/4fea5c_50f23091e7684c9686432d9cdeb3d690.pdf
    • https://static.usrfiles.com/ugd/aec2ea_adcf58480fdc4522a3e02347ad14d5a5.pdf
    • https://static.usrfiles.com/ugd/934fc3_60c1a333ee8e431991b2de259b8cf3f7.pdf
    • https://cdn.shopify.com/s/files/1/0429/6091/2537/files/io_aphix_conduit.pdf
    • https://cdn.shopify.com/s/files/1/0462/2640/7575/files/natutozepu.pdf
    • https://cdn.shopify.com/s/files/1/0450/4797/1990/files/alanerv_on_ulotka.pdf
    • https://static.usrfiles.com/ugd/f1d680_d66f0356da3d476785ac5466e5efe476.pdf
    • https://static.usrfiles.com/ugd/6a44d8_7e86949a512b43c880557849d93615fa.pdf
    • https://static.usrfiles.com/ugd/90423f_125591a96db94ac5b006a19e225b7dbf.pdf
    • https://static.usrfiles.com/ugd/0c268c_d5d51b15951748cab54b7ee48ea8f8e2.pdf
    • https://static.usrfiles.com/ugd/b85eb0_c9736b5e03d84f40922a50b30f3b9627.pdf
    • https://static.usrfiles.com/ugd/38bf1f_61f071f2748d480d812fe02ffdedeb00.pdf
    • https://static.usrfiles.com/ugd/3ed902_a5d83b660e09422694c92b835e7bdfc6.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000628e.bin
2a582827a80db075595fb3b80d5131b356cdf7a1d196196755b38d6a02b812b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x628E 4560 bytes
font_01_sfnt_off00007213.bin
94d246615e1344399c84f8e63c56c1a3957e2358b92a8580d6bda7bf3d77e5cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7213 10684 bytes
font_02_sfnt_off00009640.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x9640 4324 bytes