Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3981518bdbbfb6…

MALICIOUS

PDF

41.7 KB Created: 2020-09-01 12:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd4839b31cda2dbc47fe8566f803266f SHA-1: 5955e1c7cd200dde052a1a5a7fd03de65a9305ab SHA-256: 6f3981518bdbbfb66e5ac020cab61b4fb243e7562089afe489340b7b7eb333f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'corrugated sheet supplier' and the malicious URL, suggesting a 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.me/wix?keyword=corrugated+sheet+supplier+in+philippines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/rosofupozepigo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/35708585804.pdf
    • https://cdn.shopify.com/s/files/1/0436/7056/9113/files/video_baby_shark_original_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0459/9942/3647/files/cdc_hep_a_vaccine_information_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/0521/2832/files/70134479135.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xumilegimazuguvabunozanik.pdf
    • https://cdn.shopify.com/s/files/1/0433/6641/6534/files/95024095831.pdf
    • https://static.usrfiles.com/ugd/5ed537_437fc3c98a5c476a874b91b3c9e700b7.pdf
    • https://static.usrfiles.com/ugd/6116da_b91c75db02334980b4871deaaf7c0359.pdf
    • https://static.usrfiles.com/ugd/8b2c09_3376233f0a6d491fafc6bc5768d97be7.pdf
    • https://cdn.shopify.com/s/files/1/0461/1617/6036/files/avery_address_labels_5160_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/4492/8674/files/murenixusoloridujet.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7678/files/55728063932.pdf
    • https://cdn.shopify.com/s/files/1/0436/5176/0281/files/13557040918.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_off0000642e.bin
2436d0e9be3064d2959644a498cf513fa757d294fbd20b6dd688dc973764e5c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x642E 5124 bytes
font_01_sfnt_off00007591.bin
43121866ac8335bf6d4a7a63b40a42e6833f5bbbba0e771aaa519c787f201990
pdf-font-stream PDF embedded font (sfnt) at offset 0x7591 10708 bytes