Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd2d661ea6e46a9…

MALICIOUS

PDF

41.1 KB Created: 2020-08-09 02:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3b170204f5a524c53645e0496db0190 SHA-1: 2f5665dd534ea971f2778511fe7f7c6a028d6b7d SHA-256: dbd2d661ea6e46a9d59b6cf5b28b6458f974f285116fd2a5bd77dcd62bd9406e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, including a redirector to a malicious URL, disguised as "aptitude questions for wipro pdf". The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=aptitude+questions+for+wipro+pdf
    • http://files.luckyjacksfishing.com/uploads/1/3/0/8/130874522/likibitaf.pdf
    • http://files.laurahoxworth.com/uploads/1/3/1/4/131453251/5952655.pdf
    • http://rozufibo.sowilocommunityhigh.org/uploads/1/3/1/4/131407469/669638.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/nubimizugazejamexalomawam.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/download_idm_full_cack.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/study_bible_macarthur_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/78605879671.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/types_of_telemetry_system.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/90087812874.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/26465901095.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/welob.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/88760995229.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2874/files/salikegisuga.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/wuvudanolilokoguxofegok.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/english_adjectives_exercises_with_answers.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_off000061de.bin
521c4d787f8442521b27acf981067412129daaf906063fd39fd3023951bbefaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x61DE 5000 bytes
font_01_sfnt_off00007306.bin
b420cccfb11e1d39dcabcbca76e0149a10618c3f7792da72258bedd812c6bd55
pdf-font-stream PDF embedded font (sfnt) at offset 0x7306 10108 bytes