Malicious PDF — malware analysis report

Static analysis result for SHA-256 899831acdb59e7f4…

MALICIOUS

PDF

44.1 KB Created: 2020-08-29 23:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 530506973fd92cfc5a21b595512ba799 SHA-1: 3b856948fd8c416c1c5a28bbabedacf068bcca58 SHA-256: 899831acdb59e7f4d989588b8910f6f3573ca31555833298169dcddc7ab50f9f
154 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.club, which is disguised as a service manual for a Yamaha Timberwolf 250. This suggests a phishing or social engineering attack aimed at directing users to malicious infrastructure. The PDF also contains a large number of external links, characteristic of SEO spam or link farm techniques, further supporting the malicious intent.

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.club/wix?keyword=1998+yamaha+timberwolf+250+service+m
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/5de1df_33366e7fcaf24cfe864df4a6622ccbf4.pdf
    • https://static.usrfiles.com/ugd/73f3b0_0db7f53c000842bdbc5e89aaa487e3fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_c03b92a567b24e02867ff4b7cdb0cf4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1df06a60e2a0448bb8c8dd8cb523d366.pdf
    • https://static.usrfiles.com/ugd/b8c837_aeba14b6879c43c8a61d852a8f1d1ae3.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/50473251734.pdf
    • https://cdn.shopify.com/s/files/1/0437/6641/5514/files/gedux.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/gepalejafawekeju.pdf
    • https://cdn.shopify.com/s/files/1/0432/0496/8603/files/vuzuwowewawarozejoxilo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/best_free_reader_app_ios.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/11976845271.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9228/files/fibrosis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0438/1098/0000/files/25495160307.pdf
    • https://cdn.shopify.com/s/files/1/0459/7897/6423/files/40243465757.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/85765299586.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/suzepumosijexiromatekuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/5038/6079/files/dejen.pdf
    • https://cdn.shopify.com/s/files/1/0435/8671/5805/files/18510898071.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/muxomebe.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_off00006000.bin
c06864d7a1be1c016cef01bc039b3db17ace450d407ccd365f4d62304a0547d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6000 6220 bytes
font_01_sfnt_off00007525.bin
dba9fe5296b2f92be3aeced8bc6863bc2efceaa6dc9930d17035c1cb8bc7ded9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7525 14860 bytes

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