Malicious PDF — malware analysis report

Static analysis result for SHA-256 043d6f008cb5c00a…

MALICIOUS

PDF

54.8 KB Created: 2020-08-10 01:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c53ddbfe593cefe53e1a8c93b80a79b SHA-1: ef02ea479249972a2807be2145a6e413804fb6ef SHA-256: 043d6f008cb5c00ad56d2b3b306527d616187e8df3f3e99c23e4e72acda8ec9a
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a textbook download, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the redirector link point towards an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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=agricultural+science+focus+textbook+grade+10+download+pdf
    • http://files.mjhscounseling.com/uploads/1/3/1/4/131437785/fufupumibolebitexe.pdf
    • http://files.nicolejonesdevelopment.com/uploads/1/3/1/4/131453698/letedafiri-newarulazi-gusaw-mirimube.pdf
    • http://files.livfoodmarket.com/uploads/1/3/0/7/130776536/xonaginazalo_kubopo_renavomiwud_loruxujuk.pdf
    • http://files.bcjrlancergirlsclub.com/uploads/1/3/0/7/130775556/ronuko.pdf
    • http://files.rotaryaviation.com/uploads/1/3/1/8/131872021/nizavasapavo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/fuvori.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/50482365107.pdf
    • https://cdn.shopify.com/s/files/1/0439/0453/2648/files/57479152349.pdf
    • https://cdn.shopify.com/s/files/1/0431/5096/6950/files/10358601383.pdf
    • https://cdn.shopify.com/s/files/1/0435/6482/6783/files/luradilexibazulenemebim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/zovopinomenutusidibixo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/34371673610.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/tusukud.pdf
    • https://cdn.shopify.com/s/files/1/0439/7016/6942/files/wugetenobuzemowiko.pdf
    • https://cdn.shopify.com/s/files/1/0433/4655/9127/files/star_wars_the_force_unleashed_cheat_codes.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/17012101364.pdf
    • https://cdn.shopify.com/s/files/1/0437/9534/9661/files/perimeter_of_shapes_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4540/files/torexilafosobineg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwisosipopiwusanitilowaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/86068600078.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008713.bin
89c30949d69002dbf03bd5d85be976c2c565ec43aa5d0633803d6ce785ab2f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8713 5752 bytes
font_01_sfnt_off00009acf.bin
a8bd086e09b8d2eb59c2500152a5c21fa0fcd0f3a292e325d1614241e09bb060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ACF 10840 bytes
font_02_sfnt_off0000becd.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBECD 4324 bytes

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