Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c40f0bf64dce7c6…

MALICIOUS

PDF

48.9 KB Created: 2020-08-21 12:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3da107827ead2618beb98c6c2b264454 SHA-1: b4ffd996bc7dc08582be2f30c696b7dc3f870d2d SHA-256: 7c40f0bf64dce7c6bb497f15c68458d2929ba0b3433a28f941f5a11cc9436915
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body and embedded link structures suggest an attempt to manipulate search engine results or direct users to malicious infrastructure.

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=joining+report+letter+template
    • http://wobufal.amommachoosingjoy.com/uploads/1/3/1/4/131406071/narag_mijixug_jifabiwaza.pdf
    • http://files.jasmafusioncuisine.com/uploads/1/3/1/3/131381722/9254902.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0456/9946/5372/files/good_morning_photo_full.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/fugoposozeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/taruresorev.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/25680113456.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/25929821284.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7855/files/cnis_cadastro_nacional_de_informaes_sociais_dataprev.pdf
    • https://cdn.shopify.com/s/files/1/0429/7523/2153/files/9955766644.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/easier_english_basic_synonyms.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/neretidesalefadim.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000730f.bin
b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
pdf-font-stream PDF embedded font (sfnt) at offset 0x730F 6744 bytes
font_01_sfnt_off000083f4.bin
0942303f91cafd3b0d736fce90b87d8de6a1dc62e92534d107217aea27d093c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x83F4 4952 bytes
font_02_sfnt_off000094b2.bin
5150148f1d8023022006c26295b88081ed477837fe882900eebdd979a1129dff
pdf-font-stream PDF embedded font (sfnt) at offset 0x94B2 10224 bytes