Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3d8649fe13232d…

MALICIOUS

PDF

57.5 KB Created: 2020-08-17 10:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddbb3540cafd13fd4af6b969d111603e SHA-1: 7826a2ccfbbabefe10d17362b99b173f4992ba16 SHA-256: 1c3d8649fe13232dcda1217a5f511c6ad3555439fe822cafcc97892da9ff368a
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a search result for 'que es la quimica organica pdf'. The document also exhibits characteristics of an SEO link farm, with numerous links pointing to other PDFs, likely to manipulate search engine rankings. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the overall structure suggest a phishing or malicious redirection attempt.

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=que+es+la+quimica+organica+pdf
    • http://kaxawi.norcalsetac.com/uploads/1/3/1/4/131406709/2fd0dd5a56a2765.pdf
    • http://files.inspirenetworks.net/uploads/1/3/0/8/130874359/xugufijijebo.pdf
    • http://files.lovecreating4kids.com/uploads/1/3/2/7/132740987/1920244.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/ninako.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30347825404.pdf
    • https://cdn.shopify.com/s/files/1/0431/5788/0996/files/74235296845.pdf
    • https://cdn.shopify.com/s/files/1/0428/4196/4710/files/47698857111.pdf
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/dalabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2437/files/74360349118.pdf
    • https://cdn.shopify.com/s/files/1/0440/5395/4710/files/26984275214.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/dopikajidizo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/taxelamerodolugerida.pdf
    • https://cdn.shopify.com/s/files/1/0432/6175/5547/files/mutifijilosavomagofine.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/weather_report_hyderabad_next_week.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/l_assemble_nationale_au_cameroun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45598155969.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_off00009fd2.bin
b7eb88f0fbf503e4baaec9b3f50e6a1290e7017cdb3415df8db015f3cd3f6bd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FD2 5660 bytes
font_01_sfnt_off0000b2f7.bin
c9afd3daede5272e105d5fd8696fe61e12d6e57ee76a6881f885831d5aa8ec91
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F7 11148 bytes