Malicious PDF — malware analysis report

Static analysis result for SHA-256 624ee78e2cdfab29…

MALICIOUS

PDF

72.0 KB Created: 2020-08-14 08:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2e076a6b4d986d7975a162da1823429 SHA-1: 389361511ebc7450ad6c7bd86331579bcd537afa SHA-256: 624ee78e2cdfab29652012ac10157ec9846fa6b94f652e4fd04017c1d6ad0f23
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at ttraff.com. The document body, though heavily obfuscated, contains text related to "Gre argument essay samples pdf" and a URL that appears to be part of a link farm designed to host numerous PDF files. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring the user to click on a malicious link within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=gre%20argument%20essay%20samples%20pdf
    • http://files.northwestalbertabrighterfutures.com/uploads/1/3/0/9/130969077/4618884.pdf
    • http://files.alienghosttaxi.com/uploads/1/3/0/7/130739238/7e8b0ab37bb.pdf
    • http://luledete.insidersoman.com/uploads/1/3/1/6/131637814/f2e5a965327b3c.pdf
    • http://nokuka.clonmelglassandmirrors.com/uploads/1/3/1/4/131438800/1586403.pdf
    • http://files.jayfeenstraphotography.com/uploads/1/3/1/4/131437225/6841001.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4066/0891/files/53469219962.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/mulapasukazupivadumigur.pdf
    • https://cdn.shopify.com/s/files/1/0431/6810/4602/files/nursery_school_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0440/2066/2422/files/runescape_sentinel_fragments.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/bikamulubixujeliva.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/sazikilobo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/ruladoxepufax.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2198/files/40371166721.pdf
    • https://cdn.shopify.com/s/files/1/0439/0384/4520/files/dusapemikitimaku.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/50352766627.pdf
    • https://cdn.shopify.com/s/files/1/0434/3791/6312/files/train_reservation_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/citation_apa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/nugofesofefafuju.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/96622422057.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dafe.bin
c74a17a94d55cb8e8aea92cea430edbac7238c4f21b4a87dc2c8aca9452bd877		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 5496 bytes
font_01_sfnt_off0000eda9.bin
e68b45e2ba9b5a8bee50ce69a8914d87ea5c32dd63aee6e18b29988cd756689b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 10720 bytes

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