Malicious PDF — malware analysis report

Static analysis result for SHA-256 676c7ba9beb26fbc…

MALICIOUS

PDF

39.0 KB Created: 2020-08-07 09:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 995856c5cb4c06d8b0cf05ae882c35aa SHA-1: 22a7b327893df03c5b4d0eac7da8979bd1c3acf1 SHA-256: 676c7ba9beb26fbc60bb5d6e530af51ef599867f5548940b8a5299ee97e2fafc
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a redirector to malicious infrastructure, disguised as a dictionary download. The embedded URLs, including the primary malicious redirector at 'https://ttraff.ru/pify?keyword=oxford+dictionary+english+to+marathi+pdf+free+download', indicate an attempt to lead the user to a compromised or malicious site. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=oxford+dictionary+english+to+marathi+pdf+free+download
    • http://files.chardoncommunityactionteam.org/uploads/1/3/1/3/131384018/pugotut-newifuniz.pdf
    • http://files.glennorion.com/uploads/1/3/0/8/130874296/971363.pdf
    • http://files.resourceology360.com/uploads/1/3/2/8/132816202/gokakujal-ruxolutuzafe-vujufujuz.pdf
    • http://files.fourthmoonmusic.com/uploads/1/3/0/7/130739362/6badb3ac.pdf
    • http://files.beautyofpraelia.com/uploads/1/3/0/9/130969115/5942418.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6422/0058/files/fisetawitinetepip.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/93802221957.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/93168132607.pdf
    • https://cdn.shopify.com/s/files/1/0440/7951/3752/files/65893229473.pdf
    • https://cdn.shopify.com/s/files/1/0448/9605/9547/files/nikola_tesla_biography.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/benefits_of_effective_reading.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/88927607333.pdf
    • https://cdn.shopify.com/s/files/1/0440/1889/2965/files/10498713804.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/10970530957.pdf
    • https://cdn.shopify.com/s/files/1/0433/4911/5029/files/kusidomaneboxaxufidevoti.pdf
    • https://cdn.shopify.com/s/files/1/0433/7411/7015/files/58518696585.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7020/files/counter_strike_1._5.pdf
    • https://cdn.shopify.com/s/files/1/0431/1980/4578/files/26415953827.pdf
    • https://cdn.shopify.com/s/files/1/0428/6903/1078/files/94553928253.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_off00005933.bin
ec6978b205333c5a97722c7915358cebae584278cac5ed550b48e05f9d9c21a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5933 5860 bytes
font_01_sfnt_off00006d16.bin
154a5ac88beefa516ee7083bea79cc6b9154d4873cab91c97f95c1d98d36ea06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D16 9764 bytes

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