Malicious PDF — malware analysis report

Static analysis result for SHA-256 532dbe8fcd68d5ed…

MALICIOUS

PDF

44.6 KB Created: 2020-09-03 12:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d2bc4d2b643baf912a15d44d6d68483 SHA-1: f074c6b04876acd94860765b63545759b9d282d4 SHA-256: 532dbe8fcd68d5ed56c4cf5b057834f107560f95238d0140dc1a13bf62d1e76c
152 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm, with one of these links directing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious redirector URL suggests a phishing or malware distribution attempt.

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=worksheet+color+blue
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/98297684447.pdf
    • https://cdn.shopify.com/s/files/1/0432/2381/0203/files/anywhere_travel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/14027088219.pdf
    • https://cdn.shopify.com/s/files/1/0450/0570/1284/files/animals_name_with_images.pdf
    • https://static.usrfiles.com/ugd/fe83c3_72ff0401194645408938e13b37f132a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_236f357a6a844886b6b9d1d0f9d061e1.pdf
    • https://static.usrfiles.com/ugd/32acb1_70d5d790a8d747259b69b1c962822ccc.pdf
    • https://static.usrfiles.com/ugd/5ecadc_3ede0f3c16434f288f4ba20f8314f94f.pdf
    • https://static.usrfiles.com/ugd/b8c837_6860b9c7d6f949738318f04aabb7d47a.pdf
    • https://cdn.shopify.com/s/files/1/0429/8086/8255/files/24578231854.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/instant_root_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/ximudeluliziwejiju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/sinikasubomaxenugofavufu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071d2.bin
d6886ec848032893da49adbc49956ccea5528945f1c92db2497e3dc8f2cb0c7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D2 4892 bytes
font_01_sfnt_off00008289.bin
59037a54d4ea87039b70a8ac13057510309ea0e12bdc70da035efcb9005538ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x8289 10352 bytes