Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c70e0320f516d58…

MALICIOUS

PDF

37.2 KB Created: 2020-08-31 01:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31ffbfbce5fc541d3eda4e6185559584 SHA-1: a04aa55c041269223ac703c899e55b1f4bc1ff56 SHA-256: 1c70e0320f516d583334edb33870e11c738bc2ec3ab22c2c69f6d3f47ce8a0b6
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to lure users. One prominent link, disguised as a search result for 'fundamentals of firefighter skills 3rd edition pdf', redirects to the malicious domain 'ttraff.ru'. This suggests a social engineering attack aimed at driving traffic to malicious infrastructure, likely for further exploitation or malware delivery.

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.ru/wix?keyword=fundamentals+of+firefighter+skills+3rd+edition+pdf
    • https://cdn.shopify.com/s/files/1/0428/4334/0956/files/pogakibi.pdf
    • https://cdn.shopify.com/s/files/1/0439/3988/9310/files/5762834549.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/satapagarugebakekukivupob.pdf
    • https://static.usrfiles.com/ugd/238140_ded123685f124beab5bfd257f5a4cb3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2b9c0691c9c469990171cac812cc43f.pdf
    • https://static.usrfiles.com/ugd/24853a_a286d856038443bcb7ac367b552a6f85.pdf
    • https://static.usrfiles.com/ugd/d54300_2f3ef49ae77743ef82d091515916cb0a.pdf
    • https://cdn.shopify.com/s/files/1/0435/6171/3813/files/dataannotations_c_datetime_format.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/nth_term_of_arithmetic_sequence_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2544/8615/files/boy_meets_girl_joshua_harris_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6439/2866/files/18963001065.pdf
    • https://cdn.shopify.com/s/files/1/0432/9259/0236/files/drawing_practice_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/5118/6336/files/shotcut_video_editor_free_mac.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3128/files/91557067351.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/livasipa.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_off000050b9.bin
fee6253655722c25d2d6d0504098e1c4d37b6e7bb22f981358bd66e3e072e936
pdf-font-stream PDF embedded font (sfnt) at offset 0x50B9 5640 bytes
font_01_sfnt_off000063bb.bin
c8cf5faf91ca30fa243d7e2f37ca72737419cc44d820cbbc162e3a5e47514afd
pdf-font-stream PDF embedded font (sfnt) at offset 0x63BB 10328 bytes