Malicious PDF — malware analysis report

Static analysis result for SHA-256 136b78febd706bd1…

MALICIOUS

PDF

49.3 KB Created: 2020-08-15 00:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b85a459a501753cbdd8cabc9c7a4bbc SHA-1: e0960c078135ad236e54b2b88e5b60574ca6239b SHA-256: 136b78febd706bd10b57d3402140a4871e714779cf4815b9c3e6f9555a2bd216
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, suggesting an attempt to lead the user to a harmful site. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains a URL that appears to be part of a link farm.

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/pify?keyword=anghami+plus+apk+3.+5
    • http://xuruzilig.acuedge.net/uploads/1/3/0/8/130814758/da2c93b4748b13.pdf
    • http://sopidogo.spirithorsekingsburg.org/uploads/1/3/1/8/131856158/juxerejafexuraf-rufibajesojo-bosidi-sotepagub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4248/8998/files/fesulitatewepupiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/1766/5701/files/jixamogupagisufedukasazit.pdf
    • https://cdn.shopify.com/s/files/1/0432/0192/1184/files/86209789563.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3333/files/zoruguvutadori.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/58617670148.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/jipule.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/92478364681.pdf
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/15819638416.pdf
    • https://cdn.shopify.com/s/files/1/0431/4955/7917/files/revozoserosupib.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006add.bin
471214b0c8449c2709ef5c0ca2f70947ea96da878e2926aac790fce56edb317c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADD 5508 bytes
font_01_sfnt_off00007d75.bin
a6a66b5fecbcca965bce9273e619d6f2eaafc46312dda6280e47ebaa5167c8a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D75 11016 bytes
font_02_sfnt_off0000a333.bin
2264791c2630379540887006a2ca9615eb69f71f378a9318736486c0819f257b
pdf-font-stream PDF embedded font (sfnt) at offset 0xA333 16300 bytes