Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee80f21969c6e96…

MALICIOUS

PDF

50.0 KB Created: 2020-08-21 20:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e93e4ef05519b2d8a0d71e342a7e40c6 SHA-1: 10ba6fe139eeb5549faddc06b8ddabb6faa1e520 SHA-256: dee80f21969c6e9639dce149c1ae7bbd624fb5b51051e41466cc72d5259e23cc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'sales management study guide' and the malicious URL. This suggests a phishing or scam attempt where the user is tricked into clicking the malicious link under the guise of accessing study material. No scripts were extracted from this sample.

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=sales+management+n5+study+guide
    • http://files.know-ing.com/uploads/1/3/2/7/132740619/naxujipujiz_wisixud_vabodikiroren_feranofuwap.pdf
    • http://files.larkinswag.com/uploads/1/3/0/7/130739375/bebefotil.pdf
    • http://bavuli.personalpilatesma.com/uploads/1/3/0/7/130739235/d91eb7bf6b.pdf
    • http://files.evasimmons.com/uploads/1/3/1/6/131607053/zuxetigamiguj.pdf
    • https://cdn.shopify.com/s/files/1/0435/0584/4390/files/readme_file_format.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/printable_medical_consent_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/siluvajavigoxupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9095/9766/files/aldosterona_elevada.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/xifuworuwitijelasaviwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/new_heinemann_maths_3_answer_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8327/files/7289993903.pdf
    • https://cdn.shopify.com/s/files/1/0432/8387/3942/files/5314088670.pdf
    • https://cdn.shopify.com/s/files/1/0432/6054/3138/files/jibadukasadepaniruf.pdf
    • https://cdn.shopify.com/s/files/1/0440/4386/2181/files/9444376013.pdf
    • https://cdn.shopify.com/s/files/1/0448/5398/5442/files/morrowind_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/ramofizixusogijevifunud.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_off000066ba.bin
c9e061ec0d2d4b656cfbe0b2dee5ac2a24aac213058decef5699eb293de72296		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BA 5380 bytes
font_01_sfnt_off000078f3.bin
ee303e2c43ef9cbb00c4f6f36b4dbdfef93789e8fb0d33585992f0b165ecca00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F3 14128 bytes
font_02_sfnt_off0000a5f2.bin
792b17e2d8b7926bbf982488bb4a17e77740ea3a38fff94c5bbd2958d4a1dfd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F2 16120 bytes

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