Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7551b80396c408…

MALICIOUS

PDF

38.2 KB Created: 2020-09-10 09:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da6840e785166bffc3fb38f2f5bab6e2 SHA-1: 92346a03d2ddc37c880bf41611cf1e2186c32329 SHA-256: 0f7551b80396c4088ce15f6f564974f36104d51cf93824f7ae7ec1a534027287
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to educational worksheets, directing users to click on the malicious link. This suggests an attempt to lead the user to a malicious site, 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.link/pify?keyword=equations+of+lines+review+worksheet+answers
    • http://files.westsideestates.com/uploads/1/3/1/4/131437423/c42a09e.pdf
    • http://files.rwcmodel.com/uploads/1/3/0/7/130776037/2c73e1abc844e2.pdf
    • http://files.executivelockandsafe.com/uploads/1/3/1/3/131383456/taginome_wezut.pdf
    • http://files.ogrowneyns.ie/uploads/1/3/0/9/130969080/zemusinereg.pdf
    • http://mopara.stephaniebatemansweet.com/uploads/1/3/2/6/132681352/pipokojaxif_xivuzud.pdf
    • http://files.aylesburynaturalburials.co.uk/uploads/1/3/1/8/131860060/tuwavalibori_zokivifukubavem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/7862/2111/files/66298409593.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/34213658114.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/fivupul.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/77770940614.pdf
    • https://cdn.shopify.com/s/files/1/0434/1412/6759/files/rupinder_gandhi_movie_filmywap.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a99.bin
f85bbef874b81cbe4d17473e56cc9ecc1e6bcdfbf4145fc453d8da07448cc010
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A99 5036 bytes
font_01_sfnt_off00005bc8.bin
2f11225e00455a0ec2ecb5695bc96df1ce973d6361d53744cb95d52f268d6e85
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC8 10052 bytes
font_02_sfnt_off00007e33.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E33 4324 bytes