Malicious PDF — malware analysis report

Static analysis result for SHA-256 21223a134ed5c428…

MALICIOUS

PDF

39.3 KB Created: 2020-08-20 00:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1be455b48304cb3e6d82939ec23a1812 SHA-1: c0e2aa60eb836bad15fb762463a1d66822362b4e SHA-256: 21223a134ed5c42825e99505fb0cf01f586d540b2cb23ecaa39edb78c05c6f21
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=elder+law+answers+book'. The document body, though partially corrupted, suggests a lure related to 'elder law answers book', aligning with the redirector's keyword. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content. No scripts were extracted from this sample.

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=elder+law+answers+book
    • http://pawejelam.whatson-mg.co.uk/uploads/1/3/0/9/130969140/cf5e6cafe3.pdf
    • http://files.aestheticnursecoach.com/uploads/1/3/1/4/131438240/fotunur-wesojazanigo-jufutadewezu.pdf
    • http://files.katelyncostello.com/uploads/1/3/1/4/131438477/3a24db7b.pdf
    • http://files.2040thelanding.com/uploads/1/3/0/7/130776350/notogurikuvum_disirot_gigoduxeta_nabufinuzogeru.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/dekipubizanufejisez.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/bahishti_zewar_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/lipinigotadixafuki.pdf
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/77872820914.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/59222718085.pdf
    • https://cdn.shopify.com/s/files/1/0440/1761/4998/files/32285556804.pdf
    • https://cdn.shopify.com/s/files/1/0440/6339/1894/files/types_of_guppy_fish.pdf
    • https://cdn.shopify.com/s/files/1/0431/5535/7858/files/soxetilivesipegopija.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/10720773489.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3320/files/capacitive_fingerprint_sensor.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_off00005b44.bin
78c29f21439ed96d6b6b5a9c61136238d675235d71d2f8762be331a71bdd6569
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B44 5072 bytes
font_01_sfnt_off00006ca5.bin
b1f0a0fdc2e362adcb9e005a80f546b6875a9713ed99fdcc73dafd631a2cca90
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA5 10864 bytes