Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f7f3308541aa50…

MALICIOUS

PDF

54.9 KB Created: 2020-08-12 13:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1df2a9dffd2d4a5601894e734a1f8d4 SHA-1: ee5a218ddc0564ef65679c27263c43a3041989d6 SHA-256: 48f7f3308541aa50a0c2046bc8c8382bc0e6cd5a9da3b1982e61470e4eb44b75
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The embedded URL 'https://ttraff.com/wb?keyword=social%20stratification%20pdf' is a clear indicator of a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=social%20stratification%20pdf
    • http://files.amberabel.com/uploads/1/3/1/3/131379443/a105f.pdf
    • http://files.pastorjadeyi.net/uploads/1/3/1/3/131380308/sewejukaziv_zonab_dudeketalomegu.pdf
    • http://files.themetromonk.com/uploads/1/3/0/8/130815137/8733713.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/wudafuzapifipemitit.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/kokoxopasojefopelodidowav.pdf
    • https://cdn.shopify.com/s/files/1/0433/1945/9998/files/oh_prasie_him.pdf
    • https://cdn.shopify.com/s/files/1/0434/7173/2889/files/5141219429.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/wikizavusofunugepaluwem.pdf
    • https://cdn.shopify.com/s/files/1/0433/9387/6118/files/official_cpc_certification_study_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/98709467686.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28664871254.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7295/files/92156478173.pdf
    • https://cdn.shopify.com/s/files/1/0439/3258/2056/files/94294946905.pdf
    • https://cdn.shopify.com/s/files/1/0430/7995/8679/files/62598986144.pdf
    • https://cdn.shopify.com/s/files/1/0437/3427/0117/files/12318550749.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_off00008c52.bin
81de060b647c47a452c4d15959f29cc6bf797777affd6053bfd31f23fd3d1ae1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C52 4920 bytes
font_01_sfnt_off00009cf4.bin
2a14bfca80f3defc0bbb74fac330a2d62c5ef7dc64f2bc385de68538f733f377
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF4 10356 bytes
font_02_sfnt_off0000c051.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC051 4324 bytes