Malicious PDF — malware analysis report

Static analysis result for SHA-256 072fb4401fa04d3b…

MALICIOUS

PDF

69.3 KB Created: 2020-08-06 15:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9664d9d5ccd512ed4ccc6d2d8ce9685c SHA-1: 3f97cc9b23415419295718a0d796ea7388de3903 SHA-256: 072fb4401fa04d3b03d8959327a33d917a06ad9bdc5cd26d51409c4c694e7d14
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link disguised as an answer key for educational content, which is a common lure for advance-fee scams. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates this intent. The presence of numerous external PDF links, including one to a known malicious redirector, suggests an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.cc/pify?keyword=amoeba+sisters+asexual+reproduction+answer+key+pdf
    • http://files.cgwoodcreations.com/uploads/1/3/0/8/130813325/7972307.pdf
    • http://files.chatteriemainecoonroswell.com/uploads/1/3/0/7/130738806/6066150.pdf
    • http://files.casinodealerswebsite.com/uploads/1/3/1/3/131383493/punakonol-visawadij-jusuza.pdf
    • http://files.musclecarsandclassiccruisers.com.au/uploads/1/3/1/8/131857756/kojakom-natajakuf.pdf
    • http://files.allsystemsgrow.org/uploads/1/3/2/6/132695578/2659090.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9856/1957/files/factors_influencing_academic_performance_of_students.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/27018542082.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/bncc_2020_baixar.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/crochet_flower_pattern_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8921/files/nubomipu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5959/9765/files/liwarorusatigalanono.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/nexaxisorebadokirulukes.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1030/files/puzaroxikuwa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/paul_bogard_let_there_be_dark.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/19837548237.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/15567318693.pdf
    • https://cdn.shopify.com/s/files/1/0437/5235/8042/files/luvinaxufuliz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/bangsamoro_organic_law_advantages_and_disadvantages.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_off0000d13c.bin
f49c6e28e6f3a329c5f16053e1bbb5aaf4b2982e55cd61b4248daef07306b30f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 5756 bytes
font_01_sfnt_off0000e4d4.bin
89baf7f641844ad7c4fcb00fcf3dcea90b595031d63e71ec949b6f8711f264de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 10120 bytes

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