Malicious PDF — malware analysis report

Static analysis result for SHA-256 f169b08a23f1cae7…

MALICIOUS

PDF

50.9 KB Created: 2020-08-20 19:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d492ef37c29200f4dfe4087153f5bcce SHA-1: c98a11ff95df42a8ca6441608f0056066488af94 SHA-256: f169b08a23f1cae7b14eab32e87f5410c0eba2d607a0ab513d5e455fdf28b542
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness. The presence of a link farm and a redirector suggests the primary goal is to lure users to malicious sites, likely for phishing or to download further malware.

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.cc/pify?keyword=acretismo+placentario+pdf+2017
    • http://files.kinnistudios.com/uploads/1/3/1/0/131069978/686e72df9.pdf
    • http://virag.redriverministries.com/uploads/1/3/0/8/130874284/7058897.pdf
    • http://mufuk.pharmbytes.org/uploads/1/3/1/1/131164572/6facd23a4ddb31.pdf
    • http://files.amazingauctions.us/uploads/1/3/1/8/131859261/fubolubi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/28299857052.pdf
    • https://cdn.shopify.com/s/files/1/0436/0175/6323/files/john_deere_102_5_speed_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/94324112778.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/test_estilos_de_aprendizaje_visual_auditivo_y_kinestesico.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/dujusozujak.pdf
    • https://cdn.shopify.com/s/files/1/0428/6359/1583/files/83908055822.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/2020_sri_lanka_calendar_with_mercantile_holidays.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2481/files/6415011720.pdf
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/66358876878.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/52708976106.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://doi.org/10.33421/inmp.201791
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000861a.bin
75107f3e778ffa5415502e306bedb799cf51918fde0f7501dee497b20c9b7d64
pdf-font-stream PDF embedded font (sfnt) at offset 0x861A 5696 bytes
font_01_sfnt_off0000996a.bin
806e253bb669f21f413f7147b74920afa33fc72393db6ef995edc012a12fdca1
pdf-font-stream PDF embedded font (sfnt) at offset 0x996A 10536 bytes