Malicious PDF — malware analysis report

Static analysis result for SHA-256 d805f699b62ab554…

MALICIOUS

PDF

51.5 KB Created: 2020-08-03 14:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7f381cbaf3dd62ede76ffd9672e0125 SHA-1: 086873255a38b2da4567faa60599cb8e5daf02d6 SHA-256: d805f699b62ab55471358fd838998cf4e1101397c63aa015651b223a586dc37c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, including a known malicious redirector. The primary malicious link is https://ttraff.cc/pify?keyword=how+to+use+chinese+abacus+pdf, which is likely used to redirect users to further malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the link farm and redirector are clear indicators of a phishing or redirection attack.

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.cc/pify?keyword=how+to+use+chinese+abacus+pdf
    • http://files.penhurstacademy.co.za/uploads/1/3/0/9/130969036/bepibizepepedu.pdf
    • http://files.spacetigertattoos.com/uploads/1/3/0/7/130739654/perukovis_baretakiwebo.pdf
    • http://files.localgreenssb.com/uploads/1/3/1/4/131483110/4bcf4a8c7cdc.pdf
    • http://files.boardgameseverybodyshould.com/uploads/1/3/2/7/132712306/xifetavaz-rofivomezitelax-kuvewujoxofubuk-fujapikojovud.pdf
    • http://files.wayfinderlifecoaching.com/uploads/1/3/1/3/131381021/lukom.pdf
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/2024236053.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/8839008064.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/vazuwovezaxitet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/vizomolujo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/43718490339.pdf
    • https://cdn.shopify.com/s/files/1/0435/6793/9743/files/dugutoguwinewodufise.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7901/files/54891158973.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/41306881720.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/jujorelufonubevedanu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8496/2200/files/82730424144.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/basic_antenna_parameters.pdf
    • https://cdn.shopify.com/s/files/1/0428/7882/8700/files/8623006319.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_off00006a6a.bin
a3d7546cb4a402783f813be112037bd48b8f92f1b73807c99c2a9d9f615f85e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6A 7512 bytes
font_01_sfnt_off000083bf.bin
7b8a4591304edb282f418161ebe301019931d288ec71a2330d82daf292716f90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BF 5308 bytes
font_02_sfnt_off000095e0.bin
d0444fc452dc03671d52102f568a906806b7fb1616b32ff775aa4a20988ff5a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95E0 13440 bytes

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