Malicious PDF — malware analysis report

Static analysis result for SHA-256 520d7f1629c992b9…

MALICIOUS

PDF

44.2 KB Created: 2020-08-31 02:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbe180128ca87fb0824d7a4f9d5f57ab SHA-1: abef70060b437006d625a0d6df6981935a9d4c33 SHA-256: 520d7f1629c992b92d6e0715170cd83932279447c6d5f7a9b23ef53dec8597eb
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to obscure malicious destinations. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/wix?keyword=audax+pr+130+p+20+hr+impuesto`. The document body contains obfuscated text and the malicious URL, further supporting the redirection attempt.

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/wix?keyword=audax+pr+130+p+20+hr+impuesto
    • https://cdn.shopify.com/s/files/1/0435/8874/7423/files/monoprice_maker_select_v2_upgrades.pdf
    • https://cdn.shopify.com/s/files/1/0438/4129/0397/files/14764738815.pdf
    • https://cdn.shopify.com/s/files/1/0437/9967/5041/files/98918051696.pdf
    • https://cdn.shopify.com/s/files/1/0437/4206/8887/files/e2_80_9ceu_fico_e2_80_9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_356dc075a8df438885c06052ce8c0c88.pdf
    • https://static.usrfiles.com/ugd/23e9be_6d76d512635f4b7987d99aac4fab7703.pdf
    • https://static.usrfiles.com/ugd/0df15e_23f17dc7e7854fb68083bbf2c5e02bb9.pdf
    • https://static.usrfiles.com/ugd/58a813_4ee23d890f3f46ecae7e65328b500e21.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d111c0e31f545549e6df551deddc367.pdf
    • https://static.usrfiles.com/ugd/fe83c3_52cbc0b021864a618ee9c5f3d2a59c8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab7a096ce89f4b098577212538215d70.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_9bc56767ad654881bb121cd42c15fd37.pdf
    • https://static.usrfiles.com/ugd/739437_db223ef2b49e435487e68501a5c70bc4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006030.bin
6fbeefa8591ddfc365d41f2ee85047a0909aabd16efbc3399dc7b9127f870661
pdf-font-stream PDF embedded font (sfnt) at offset 0x6030 5492 bytes
font_01_sfnt_off000072e0.bin
c4543aeaf0dc04d65cda9ab373e709b665ff583a95f22c38c5ab73f9d631699b
pdf-font-stream PDF embedded font (sfnt) at offset 0x72E0 10212 bytes
font_02_sfnt_off000095e7.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x95E7 4324 bytes