Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d919942a66557d…

MALICIOUS

PDF

44.3 KB Created: 2020-08-18 23:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a7edebe3ce344cd5951436f886758c5 SHA-1: b921c6df2caf9ef3888428392ed61ceed8de12a4 SHA-256: 08d919942a66557df5c7f799ece77b509ca9f9db9eae487cb082f644e412d42f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a phishing or scam attempt. The document body, though partially obfuscated, includes the text 'Codecademy ruby on rails answers' and a URL to a redirector, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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=codecademy+ruby+on+rails+answers
    • http://files.askahealthcaretraveler.com/uploads/1/3/1/3/131398560/filixojevukavifebabo.pdf
    • http://files.amalficoastreview.com/uploads/1/3/1/3/131381452/2302694.pdf
    • http://files.foodbiomedicalscience.com/uploads/1/3/1/4/131406799/sabikogu_xujepesuparoz.pdf
    • http://files.lindahugues.com/uploads/1/3/1/8/131858287/butip_lemomujatebiz_zifipexizefu.pdf
    • http://files.mcconservation.org/uploads/1/3/1/4/131438245/5845220.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/sisoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/74405314271.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1860/files/davewenufebonemawomatali.pdf
    • https://cdn.shopify.com/s/files/1/0441/0087/8488/files/sims_3_empty_worlds.pdf
    • https://cdn.shopify.com/s/files/1/0444/3108/1639/files/dmv_14_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/pathophysiology_of_viral_hepatitis.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/ccrn_study_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/nuwawidive.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0496/files/dagekudagowibuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/difimu.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_off00007042.bin
23412e2a05d4a979bca29961c7973dfea949c79b124b00b93b0c0daa364c0a1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7042 5324 bytes
font_01_sfnt_off0000824e.bin
ecbaf00865bb7e88db579de0194498983ee68d632818289ce2d73f34655e523c
pdf-font-stream PDF embedded font (sfnt) at offset 0x824E 9796 bytes