Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a7d584e1877d1d…

MALICIOUS

PDF

38.1 KB Created: 2020-09-01 02:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caca89fa8d5cc72e95aa413b79670eff SHA-1: ba8989ab07ede74daa72f383a77436478b38b69d SHA-256: 32a7d584e1877d1d62ed2df6a85ad8745869e293e3de9a9a05178f37e5ea541a
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for 'ps emulator for android free'. This suggests a phishing or scam attempt to redirect users to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious URL is the primary indicator.

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.ru/wix?keyword=ps+emulator+for+android+free
    • https://static.usrfiles.com/ugd/8d57bd_2652a22e878b4499821bb76e758ab0cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_611ab0e9ed0f4056b6505d083582c493.pdf
    • https://static.usrfiles.com/ugd/a18aa6_ace1b2eefc794a18a7a738afd759f3f4.pdf
    • https://cdn.shopify.com/s/files/1/0436/8505/2566/files/degijivetak.pdf
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/buvobajujarobekudawa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3300/2145/files/sabewikorumabufopofojo.pdf
    • https://cdn.shopify.com/s/files/1/0446/6756/8291/files/o_que__aromaterapia.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/kimonodefapifamisediz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/22188254528.pdf
    • https://cdn.shopify.com/s/files/1/0437/7447/6440/files/tuzozegasalifibodi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6070/files/aa_ante_amalapuram_song.pdf
    • https://static.usrfiles.com/ugd/a91264_53cb597f3df4475681c37e0949445f12.pdf
    • https://static.usrfiles.com/ugd/e2c250_9e563d4730ee4b9e816d7cafcf171b04.pdf
    • https://static.usrfiles.com/ugd/0bcf16_52bcea4c45ba4cecb49aaf3da3970b05.pdf
    • https://static.usrfiles.com/ugd/b916f4_6875692bf27440359a403beb4934e4f7.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_off00005745.bin
b471cd8a270daf5e54e6a504087b949205a384ad6b93b98bb438adeaca8eaffb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5745 5052 bytes
font_01_sfnt_off0000685b.bin
bcf7687d5905fa8be012c76c62b4eccc5e79ef1c44ddfb700df79b4083d13ec9
pdf-font-stream PDF embedded font (sfnt) at offset 0x685B 10492 bytes