Malicious PDF — malware analysis report

Static analysis result for SHA-256 15074ef5bd5e1615…

MALICIOUS

PDF

42.7 KB Created: 2020-08-07 13:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f4fa1620a7b7d0ae37854d368ffaf58 SHA-1: a4eeae0acc55d701e83b14cdc50a9ab8a608ff73 SHA-256: 15074ef5bd5e16155c4216e73fe5054d23f41c8ea86ce60d7d7f1d89ab9ed9d8
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external links, with one specifically identified as pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector suggest an attempt to lure users to harmful content, likely as part of a phishing or spam campaign.

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.ru/pify?keyword=anticorpos+heter%25C3%25B3filos+pdf
    • http://files.andypresentations.com/uploads/1/3/1/4/131454098/ffa36ad.pdf
    • http://files.ethanemersonmusic.com/uploads/1/3/0/8/130874284/dirofo.pdf
    • http://files.artzhc.com/uploads/1/3/1/4/131455158/jakilif.pdf
    • http://files.glenelder.com/uploads/1/3/2/6/132696280/noxenevi.pdf
    • http://files.mesbodysculpting.com/uploads/1/3/0/8/130814492/3041233.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/govomadasabazumolawibi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/98702895874.pdf
    • https://cdn.shopify.com/s/files/1/0437/7618/0376/files/organic_chemistry_jones_5th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/0077/2246/files/kobofajir.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/sanalugireburerod.pdf
    • https://cdn.shopify.com/s/files/1/0437/7185/5002/files/75893564898.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/32760518478.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6589/files/sibegotixavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/88715011532.pdf
    • https://cdn.shopify.com/s/files/1/0437/4963/8295/files/46039180509.pdf
    • https://cdn.shopify.com/s/files/1/0429/3568/1180/files/funelisifunelanid.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_off00006708.bin
c251d961b7129de6d2c114c17741b467bd91b685b4f0404a53c11b24363efd7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6708 5156 bytes
font_01_sfnt_off00007851.bin
cd7da250ee0aaa7663bc04063d70e0966d775fde44d4d73131f244a8bbd4c00a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7851 11208 bytes

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