Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3b361fd1d10e17…

MALICIOUS

PDF

42.9 KB Created: 2020-09-01 06:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cb52928ac5c14465eda9028db30684b SHA-1: 234ed2ce49c2aacc14a6608df9a34bb69e3c520b SHA-256: ee3b361fd1d10e17d836e76deaaec38f154abd2e5df8af2ff36a6739f0b6bed4
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, specifically pointing to 'https://ttraff.ru/wix?keyword=pencil+sketch+brushes+photoshop+free'. This URL is presented within the document's body, disguised as a resource for free Photoshop brushes. The ML classifier also strongly flagged this PDF as malicious. The document's purpose appears to be a lure to a malicious site, likely for further exploitation or credential harvesting.

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=pencil+sketch+brushes+photoshop+free
    • https://cdn.shopify
    • https://static.usrfiles.com/ugd/409ca8_6d189f02521d42809fd44864a0512d61.pdf
    • https://static.usrfiles.com/ugd/b8c837_3743659eb6c8433fa757ec478e5318f0.pdf
    • https://static.usrfiles.com/ugd/99965f_6f22c7ae08fb44468b3da218de2e396b.pdf
    • https://static.usrfiles.com/ugd/b42fd6_ad22595085be4f03bed89cf81750035d.pdf
    • https://static.usrfiles.com/ugd/b8c837_196561d7a576476882f04beb75d6135d.pdf
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/same_and_different_worksheets_for_nu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6043/5871/files/7701336947.pdf
    • https://cdn.shopify.com/s/files/1/0438/2877/3021/files/kakajusamekizilekizufotat.pdf
    • https://cdn.shopify.com/s/files/1/0460/0001/3479/files/97719211112.pdf
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/15142627725.pdf
    • https://cdn.shopify.com/s/files/1/0438/0111/6833/files/miwijazafu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6936/4629/files/napekitudoluleguxarusi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8901/6472/files/patadilijogigepadilame.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/51552447037.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_off0000699b.bin
b809d69c811658fe73955ed2cad63bc28fff45a5674f391951e937738ef69280
pdf-font-stream PDF embedded font (sfnt) at offset 0x699B 5096 bytes
font_01_sfnt_off00007aec.bin
0915c6859462536decd68a286e9087f8850a4300c0967f4b1da19d1b15400f70
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEC 10400 bytes