Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a85873bbe06a229…

MALICIOUS

PDF

59.7 KB Created: 2020-09-07 14:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3e20ee4d01d3070c9e9c47b21c4215a SHA-1: e57eeb380e4a79366197900d331f4d4d2d871965 SHA-256: 2a85873bbe06a229a0fbc2f25246bde66742f92801e72d67a877fcf2f3872264
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains the string "Maplestory leveling guide 2019 pathfinder" and a URL that matches the malicious redirector. This suggests a social engineering lure to drive traffic 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.link/wix?keyword=maplestory+leveling+guide+2019+pathfinder
    • https://static.usrfiles.com/ugd/d4c4cf_bc1ff42b863a45d4a5137b051aa2a040.pdf
    • https://static.usrfiles.com/ugd/685707_3db1582d22284d89a6eb9d8216851cce.pdf
    • https://static.usrfiles.com/ugd/b8c837_88e5ae1a84cb4ed89e333e06beae123e.pdf
    • https://static.usrfiles.com/ugd/63022f_9b668ca10a844e07a37558463065b0c5.pdf
    • https://static.usrfiles.com/ugd/2d1648_11151703ac7c4b739e64041b79c55da3.pdf
    • https://static.usrfiles.com/ugd/a107db_7c80c282c5814558b8ee724e46ef67d1.pdf
    • https://static.usrfiles.com/ugd/2f8cea_542e43f58be644df89b8b4406c95a0fc.pdf
    • https://static.usrfiles.com/ugd/92ee2b_efb03ea98ad047e0b284cb68d5840972.pdf
    • https://static.usrfiles.com/ugd/ea2f88_fb748c0c1b0541e487138fcd349eb569.pdf
    • https://static.usrfiles.com/ugd/e1c37d_fec411ba7d894106978fe3a6f34e03a1.pdf
    • https://cdn.shopify.com/s/files/1/0438/8857/4632/files/fusaxorevujoxoju.pdf
    • https://cdn.shopify.com/s/files/1/0435/1390/5311/files/new_handbook_of_business_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/8412/0225/files/stepparent_adoption_forms_in_texas.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0171/files/72536403831.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mirogorozizodixomalejog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008543.bin
35ec16a85fdb08786746de0a30658e19ea977ad50c31a4562e63bda79b59342a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8543 5952 bytes
font_01_sfnt_off000099a4.bin
5e553f07895a783409f49e33b363576fcf95370052557267237dc593b82f50d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x99A4 15580 bytes
font_02_sfnt_off0000ca10.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 16092 bytes